Sparks in Microwave
Most recent answer: 03/02/2018
- Ishrat (age 46)
There are two issues here: 1) The use of metal containers, and 2) Small bits of metal (eg, decorative).
1) Metals (and conductors in general)" screen electric fields, so food enclosed in a metal container (e.g., wrapped in foil) won't be heated up. This also happens, but to a lesser extent, with a metal cup even though the cup does not completely enclose the food,
2) If you have a container with some thin decorative metal, you will get sparks if there are small gaps in the metal, or often at sharp edges of the metal. Even if there are no gaps initially, if the metal is very thin, electrical currents will melt the metal, creating gaps. This effect won't happen with a teapot, which is more difficult to melt, but you won't be able to boil the water that it contains.
(published on 03/02/2018)