Physics Van 3-site Navigational Menu

Physics Van Navigational Menu

Q & A: Calculating Underwater Pressure

Learn more physics!

Most recent answer: 12/12/2015
Q:
What depth of water (at sea level) would produce 2 atmospheres of air pressure?
cheater what to do when husband cheats wifes who cheat
the best android phone link phone tracking apps
married men cheat with men open wifes cheat
walgreens coupons deals site walgreens photo print coupons
discount card prescription site print cvs
levaquin pill internetsellout.com furosemide pill
prescriptions coupons go discount coupon for viagra
prescription drugs discount cards blog.plazacutlery.com coupons for viagra printable
prescription discount coupons free prescription drug cards viagra discount coupons online
coupon for viagra open viagra discount coupons online
can i take minocycline with birth control can i take minocycline with birth control can i take minocycline with birth control
lisinopril and energy drinks lisinopril and energy drinks lisinopril and energy drinks
lisinopril and bisoprolol lisinopril and bisoprolol lisinopril and bisoprolol
acheter viagra pas acheter viagra pas acheter viagra pas
discount prescription drug cards open prescription discounts cards
voltaren ára house.raupes.net voltaren
venlafaxine gewichtstoename read venlafaxine fk
augmentin générique arbot.cz augmentin sirop
champix alkohol go champix
seroquel 25 mg site seroquel debljanje
fluvoxamine (luvox) open fluvoxamina bula
cialis cialis discount cialis walgreen coupon
buscopan hund buscopan dosierung buscopan dragees
cefdinir red stool ski-club-auringen.de cefdinir nedir
singulair 4 mg granulat scottdangelo.com singulair patient information

- dee wood
atlanta, georgia - usa
A:

Dee -

Well, let’s see if we can work this one out. First, we have to understand how pressure is measured. If we were to take a one inch column of air all the way up through the atmosphere, it would weigh 14.7 pounds. For this reason, we like to say that the standard air pressure (at sea level) is 14.7 pounds per square inch (psi). Water weighs more than this, though. Each one inch column that’s one foot deep will weigh 0.445 pounds.

So if you’re right at sea level, the pressure will be 14.7 psi. And for every foot you go underwater, you add another 0.445 psi. So at one foot deep, the pressure would be 14.7 psi + 0.445 psi = 15.145 psi. And at two feet deep it would be 14.7 psi + 2*(0.445 psi) = 15.59 psi, etc. In order to get to 2 atmospheres worth of air pressure, you would need to get to the point where there’s 29.4 psi (2 times 14.7 psi). To get to 29.4 psi, it turns out that you would need to be 33 feet deep. (Since 14.7 psi + 33*0.445 psi = 29.4 psi.)

-Tamara

why people cheat marriage affairs how many people cheat
married woman looking to cheat go most women cheat
married men cheat with men why husbands cheat wifes cheat
types of abortions site what happens when you get an abortion
cvs discount card cvs new prescription coupon prescription drugs discount cards
prescription drugs discount cards link coupons for viagra printable
viagra coupons from manufacturer liberitutti.info drug discount coupons
viagra coupon card blog.brunothalmann.com viagra free coupon
viagra coupons free softballspa.com drug coupons
acheter viagra pas http://acheterviagraenfrance.com/pas acheter viagra pas
cialis manufacturer coupon cialis discounts coupons prescription drug coupons
venlafaxine gewichtstoename read venlafaxine fk
niacine movidafm.net niacin v hrani
flibanserin online flibanserin buy flibanserin buy
proscar vs propecia for hair loss proscar pris proscar pris
cialis cialis discount cialis walgreen coupon
buscopan hund go buscopan dragees
cefdinir red stool ski-club-auringen.de cefdinir nedir
amlodipine 5 mg amlodipine bijwerkingen amlodipine accord
voltaren retard link voltaren spray
allods online go allo allo
allods online cwblog.centralworld.co.th allo allo
singulair 4 mg granulat site singulair patient information

(published on 10/22/2007)

Follow-Up #1: density of water

Q:
The number of psi/foot depth is .433, not .445. You should state in your answer how this is derived: Water weighs 1gm/cubic cm.
hillcrest abortion clinic stories of abortion live abortion video
married men cheat with men women that cheat with married men wifes cheat
best android spy apps to spy on phones how to spy on an android phone
married cheaters redsoctober.com dating for married men
discount card prescription go print cvs
priligy 30mg bistromc.org cialis 40mg
online discount pharmacy viagra coupons and discounts coupon for prescription
prescriptions coupons markthrice.com discount coupon for viagra
prescription drugs discount cards link coupons for viagra printable
coupons for prescriptions new prescription coupons prescription drugs discount cards
viagra coupon card blog.brunothalmann.com viagra free coupon
discount prescriptions coupons pet prescription discount card internet drug coupons
1 wk pregnant abortion pill article on abortion
can i take escitalopram in the morning link can i take escitalopram in the morning
lisinopril and energy drinks lisinopril and energy drinks lisinopril and energy drinks
diabetes affect sexuality diabetes sexuality treatment
viagra bestellen online viagra online shop pillen kopen
where buy viagra online side effects from viagra use online viagra buy
lilly cialis coupon click coupons prescriptions
venlafaxine gewichtstoename idippedut.dk venlafaxine fk
naprosyn roche rileytech.net naprosyn nedir
niacine movidafm.net niacin v hrani
seroquel 25 mg click seroquel debljanje
cefdinir red stool ski-club-auringen.de cefdinir nedir
cefdinir red stool cefdinir nedir cefdinir nedir
lasix injetavel lasix efeitos colaterais lasix
nurofen cold and flu dosage internetsellout.com nurofen plus dosage
cialis coupon card coupon prescription cialis coupon
trental cena trenitalia trental nuspojave

- Brian Sargent (age 62)
Tyngsboro, Massachusetts
A:
Brian- Thanks, youre right. a square inch column of pure water one foot deep has 2.54^ 3*12 cubic cm (since there are 2.54 cm/inch) so the mass is 196 gm, giving a weight of 0.433 lb. I bet that the answer above was concerned with actual sea water, however, and that's a little denser due to the dissolved salt.

Mike W.
why people cheat catch a cheat how many people cheat
internet drug coupons open prescription coupon
types of abortions the weeks of pregnancy what happens when you get an abortion
discount card prescription go print cvs
coupons rx prostudiousa.com www.januvia.com coupons
ventolin 2mg thyroxine 25mcg deltasone 40mg
free online coupons pharmacy coupon new prescription coupons
online discount pharmacy dotnetblogengine.net coupon for prescription
new prescription coupon areta.se prescription coupon card
prescription drugs coupons click viagra coupon card
coupons for prescriptions new prescription coupons prescription drugs discount cards
coupons for prescriptions floridafriendlyplants.com prescription drugs discount cards
cialis coupons from lilly coupon for free cialis coupons for prescriptions
naproxennatrium site naproxen migraine
venlafaxine gewichtstoename read venlafaxine fk
ibuprofen rapid tracyawheeler.com ibuprofen
cialis driverblog.suddath.com cialis walgreen coupon
buscopan hund go buscopan dragees
renovacija stanovanja click renova g
how expensive is an abortion abortion clinic abortion clinics dallas tx

(published on 11/03/2007)

Follow-Up #2: density of sea water

Q:
She was correct in the beginning since salt water is denser than fresh, .445 psi per foot to be exact :P
why people cheat marriage affairs how many people cheat
cheater read wifes who cheat
the best android phone mealmixer.com phone tracking apps
internet drug coupons open prescription coupon
types of abortions site what happens when you get an abortion
buy sildenafil 100mg viagra without a doctor prescription viagra 100 mg
discount card prescription damske.com print cvs
diprolene go furosemide 40mg
viagra coupon card free prescription cards discount viagra free coupon
pfizer coupons for viagra viagra coupon viagra discounts coupons
coupons prescriptions blog.brunothalmann.com manufacturer coupons for prescription drugs
coupon for viagra viagra trial coupon viagra discount coupons online
can i take antabuse and naltrexone can i take antabuse and naltrexone can i take antabuse and naltrexone
lisinopril and energy drinks lisinopril and energy drinks lisinopril and energy drinks
lisinopril and bisoprolol lisinopriland.net lisinopril and bisoprolol
viagra bestellen online viagra pillen kruidvat pillen kopen
cialis coupons from lilly prescription drug cards coupons for prescriptions
cialis manufacturer coupon link prescription drug coupons
prescription drug coupons codesamples.in drug coupon
cialis coupon card read cialis coupons from manufacturer
claritinekombo warpedfish.co.uk claritine za psa
champix alkohol mdwguide.com champix
flibanserin online click flibanserin buy
motilium enceinte blog.cr-inside.org motilium et grossesse

- Anonymous
A:
I think we're all in agreement here. That density is the typical density of seawater. In general, the density of saltwater depends on how salty it is.

Mike W.
hillcrest abortion clinic stories of abortion live abortion video
married woman looking to cheat My wife cheated on me most women cheat
married men cheat with men why husbands cheat wifes cheat
abortion pill clinics abortion pill prices for abortions
buy sildenafil 100mg buy sildenafil 100mg viagra 100 mg
ventolin 2mg bistromc.org deltasone 40mg
coupons for prescriptions new prescription coupons prescription drugs discount cards
diabetes affect sexuality diabetes sexuality treatment
viagra bestellen online viagra pillen kruidvat pillen kopen
prescription drug coupons cialis coupons from lilly drug coupon
drug discount coupons blog.suntekusa.com discount coupons for prescriptions
drug discount coupons blog.suntekusa.com discount coupons for prescriptions
lilly cialis coupon coupons for prescriptions coupons prescriptions
claritinekombo read claritine za psa
naproxennatrium zygonie.com naproxen migraine
voltaren ára voltaren duo voltaren
champix alkohol mdwguide.com champix
flibanserin online click flibanserin buy
cialis thepoliticalsword.com cialis walgreen coupon
renovacija stanovanja click renova g
prescriptions coupons emergent-ventures.com drug prescription card

(published on 01/14/2008)

Follow-Up #3: SI pressure

Q:
I understand how it works in our units, but what about in SI units?
why people cheat catch a cheat how many people cheat
cheater read wifes who cheat
the best android phone mealmixer.com phone tracking apps
married men cheat with men open wifes cheat
best android spy apps to spy on phones how to spy on an android phone
walgreens coupons deals blog.mrwade.co.uk walgreens photo print coupons
married cheaters site dating for married men
discount card prescription go print cvs
rite aid prescription transfer coupon open coupon rite aid
coupons rx prostudiousa.com www.januvia.com coupons
prescriptions coupons go discount coupon for viagra
prescription drugs coupons go viagra coupon card
viagra coupon card blog.brunothalmann.com viagra free coupon
viagra coupons free read drug coupons
prescription discount coupons free prescription drug cards viagra discount coupons online
discount prescriptions coupons mba-institutes.com internet drug coupons
manufacturer coupons for prescription drugs viagra 2016 coupon coupon prescription
can i take minocycline with birth control can i take minocycline with birth control can i take minocycline with birth control
diabetes affect sexuality cialis dosage information diabetes sexuality treatment
acheter viagra pas acheter viagra pas acheter viagra pas
cialis coupons from lilly prescription drug cards coupons for prescriptions
cialis manufacturer coupon link prescription drug coupons
cialis coupon lilly click transfer prescription coupon
prescription drug coupons cialis coupons from lilly drug coupon
lilly cialis coupon prostudiousa.com coupons prescriptions
claritinekombo read claritine za psa
kamagra wikipedia blog.jrmissworld.com kamagra shop
ibuprofen rapid ibuprofen spc ibuprofen
buscopan hund go buscopan dragees
amlodipine 5 mg link amlodipine accord
renovacija stanovanja renovator renova g
motilium enceinte blog.cr-inside.org motilium et grossesse

- Scott Norton (age 18)
Trumbull, CT, 06611
A:
In SI units, atmospheric pressure is very close to 105 Pascal. Water has a mass of 103 kg/m3. The gravitational acceleration near the Earth's surface is about 9.8 m/s2. So that means the pressure goes up about 9800 Pa for each meter down, a little more for salt water.

Mike W.
cheater click wifes who cheat
married woman looking to cheat My wife cheated on me most women cheat
types of abortions the weeks of pregnancy what happens when you get an abortion
ventolin 2mg thyroxine 25mcg deltasone 40mg
prescription drugs coupons click viagra coupon card
pfizer coupons for viagra prescription coupon viagra discounts coupons
lisinopril and energy drinks lisinopril and energy drinks lisinopril and energy drinks
viagra bestellen online viagra pillen kruidvat pillen kopen
where buy viagra online side effects from viagra use online viagra buy
augmentin générique read augmentin sirop
arcoxia 30 go arcoxia wiki
fusidinezuur kopen blog.jp-sa.org fusidic acid
sildenafil pfizer link sildenafil sandoz
cialis cialis discount cialis walgreen coupon

(published on 09/17/2009)

Follow-Up #4: Water pressure under an ice cream cone and a test tube

Q:
I have two questions.... How do I know the pressure under one meter of water if there was no air? If I was at the bottom of a giant ice cream cone full of water would there be more pressure than if I was at the bottom of a giant test tube thats just as high? Does it matter if theres more water on top or is it just about how deep it is? Im just wondering about water not air.
cheater read wifes who cheat
walgreens coupons deals blog.mrwade.co.uk walgreens photo print coupons
discount card prescription go print cvs
ventolin 2mg thyroxine 25mcg deltasone 40mg
prescriptions coupons markthrice.com discount coupon for viagra
free viagra samples coupon open viagra 2016 coupon
viagra coupon card free prescription cards discount viagra free coupon
coupons prescriptions blog.brunothalmann.com manufacturer coupons for prescription drugs
coupons prescriptions prescription savings cards manufacturer coupons for prescription drugs
discount prescriptions coupons mba-institutes.com internet drug coupons
where buy viagra online http://viagraforsaleuk1.com online viagra buy
cialis price online open cialis price history
cialis coupon card eblogin.com cialis coupons from manufacturer
coupons for prescriptions open drug prescription card
naproxennatrium site naproxen migraine
flibanserin online click flibanserin buy
fluvoxamine (luvox) open fluvoxamina bula
buscopan hund buscopan dosierung buscopan dragees
cefdinir red stool ski-club-auringen.de cefdinir nedir
nurofen cold and flu dosage internetsellout.com nurofen plus dosage

- Jackie (age 16)
A:

Pressure is how much force you feel per unit area. Every force that acts on a surface corresponds to a pressure. For example, when you press a button, you are putting pressure on it. In water (or air), the weight of the water (or air) above you exerts a force on you, so you feel water pressure (or atmospheric pressure). The presence of water pressure does not require air, so we can measure pressure directly under water. There are many ways to measure pressure. For example, we can measure how much force is exerted by water and divide it by the area of the detector.

You mentioned an important point that water pressure is the same at the same depth, regardless of the shape of the container. This may be a little counter-intuitive because there is more water in a giant ice cream cone than a giant test tube. But remember that the cone is also supporting some weight of the water! The surface of the cone is facing upward; while the wall of the test tube is vertical and cannot support any water. As a result, you would feel the same water pressure if you were in these containers of the same height.


- Tsung

married men cheat with men open wifes cheat
married cheaters site dating for married men
coupons rx prostudiousa.com www.januvia.com coupons
levitra pill imitrex 25mg tadalafil pill
free online coupons onlineseoanalyzer.com new prescription coupons
can i take escitalopram in the morning can i take escitalopram in the morning can i take escitalopram in the morning
lisinopril and bisoprolol lisinopriland.net lisinopril and bisoprolol
cialis dosage and cialis dose for copd pts
prescription drug coupons codesamples.in drug coupon
naproxennatrium zygonie.com naproxen migraine
venlafaxine gewichtstoename read venlafaxine fk
augmentin générique arbot.cz augmentin sirop
augmentin générique read augmentin sirop
champix alkohol go champix
niacine movidafm.net niacin v hrani
flibanserin online flibanserin buy flibanserin buy
cefdinir red stool ski-club-auringen.de cefdinir nedir
amlodipine 5 mg link amlodipine accord
nurofen cold and flu dosage internetsellout.com nurofen plus dosage
motilium enceinte motilium notice motilium et grossesse
singulair 4 mg granulat scottdangelo.com singulair patient information
how expensive is an abortion link abortion clinics dallas tx
vivitrol alcohol naltrexone alcoholism medication narcan challenge

(published on 01/20/2011)

Follow-Up #5: pressure under seawater

Q:
References to 1 foot of change in sea water in PSI was initially stated correct as.445 psi per foot of change (Correct as per U.S. Navy dive tables) It was countered by .443 (perhaps fresh water?) Also when calculating pressure at depth the sea level pressure value e.g. 14.7 is not used in the pressure vs. depth calculations and starts at 0. We (Navy divers) have always used 44.5 psi per 100 ft.
hillcrest abortion clinic site live abortion video
types of abortions read what happens when you get an abortion
coupons rx open www.januvia.com coupons
coupons rx prostudiousa.com www.januvia.com coupons
online discount pharmacy viagra coupons and discounts coupon for prescription
can i take minocycline with birth control can i take minocycline with birth control can i take minocycline with birth control
viagra bestellen online viagra online shop pillen kopen
prescription drug coupons cialis coupons from lilly drug coupon
lilly cialis coupon coupons for prescriptions coupons prescriptions
discount prescription drug cards open prescription discounts cards
claritinekombo read claritine za psa
voltaren ára go voltaren
naprosyn roche naprosyn wiki naprosyn nedir
flibanserin online click flibanserin buy
sildenafil pfizer link sildenafil sandoz
proscar vs propecia for hair loss proscar proscar pris
amlodipine 5 mg link amlodipine accord
voltaren retard voltaren pomada voltaren spray
cialis coupon card evans.com.mx cialis coupon
trental cena trental trental nuspojave
how expensive is an abortion abortion clinic abortion clinics dallas tx

- Bob La Bonte (age 73)
Victoria, TX USA
A:

Hi Mr. La Bonte,

I unfortunately could not locate the exact information on the website that you are referring to. But as I understand, the issue is about the pressure at sea level. So as you dive deeper down the sea, the total measured pressure will be sum of the atmospheric pressure exerted on the water surface + liquid pressure due to a water column between you and the surface. So 14.7 corresponds to the former value, whereas your 0.445 psi/ft correspond the latter contribution. So it all depends on what one refers to when talking about the "pressure".

Yes, the discrepancy between 0.443-0.445 depends on the salt level, since pressure under some height of a liquid is density dependent, which in turn depends on the salt concentration. So such numbers may slightly vary between the Pacific Ocean and the Mediterrenean Sea. Freshwater would differ by more, since it's 2 or 3 % les dense than seawater.

Tunc+mw

cheater read wifes who cheat
hillcrest abortion clinic site live abortion video
the best android phone how to spy on cell phones phone tracking apps
internet drug coupons open prescription coupon
married men cheat with men why husbands cheat wifes cheat
rite aid prescription transfer coupon open coupon rite aid
finasteride lasix 40mg cialis 80mg
free online coupons onlineseoanalyzer.com new prescription coupons
free online coupons onlineseoanalyzer.com new prescription coupons
imitrex 50mg thyroxine flagyl 200mg
new prescription coupon discount drug coupons prescription coupon card
viagra coupon card blog.brunothalmann.com viagra free coupon
pfizer coupons for viagra viagra coupon viagra discounts coupons
manufacturer coupons for prescription drugs viagra coupons 2016 coupon prescription
acheter viagra pas acheter viagra pas acheter viagra pas
acheter viagra pas acheter viagra pas acheter viagra pas
coupons for prescriptions mha.dk drug prescription card
discount prescription drug cards cialis online coupon prescription discounts cards
naproxennatrium click naproxen migraine
venlafaxine gewichtstoename idippedut.dk venlafaxine fk
champix alkohol go champix
allods online cwblog.centralworld.co.th allo allo
prescriptions coupons cialis coupon drug prescription card
how expensive is an abortion abortion clinic abortion clinics dallas tx

(published on 12/12/2015)

Follow-up on this answer.