11
votes
2answers
2k views

Why do grapes in a microwave produce plasma?

Some of you may know this experience (Grape + Microwave = Plasma video link): take a grape that you almost split in two parts, letting just a tiny piece of skin making a link between each half-part. ...
4
votes
0answers
88 views

Handling halogen lamps

When consulting manuals, electricians, online sources, etc., they always instruct you to handle halogen light bulbs with gloves. The "explanation" that usually accompanies this statement is that oils ...
18
votes
3answers
5k views

Why does the water rise?

It's a very popular experiment (eg), from elementary school : put a burning candle on a dish filled with water, cover the candle with an inverted glass: after a little while, the candle flame goes ...