Black Steam

Questions about physics stuff?

- why are black steam radiators better than white/silver ones?
- where does ice goes why it slowly melts off a sidewalk?
- why is it easier to open a jar after running it under hot water?

1) Black absorbs heat a lot more than white/silver. Ever gone in the sun in a black t-shirt? Try it and you will see what I mean.

2) It turns into water and trickles away. So probably to the sewer.

3) The lid is metal and the jar is glass. Metal expands when heated up, like the mercury in a thermometer expands and creeps up the tube (Mercury is a liquid metal). So the lid expands and becomes bigger than the jar it is clamped around, loosening the seal.

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