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Answers to Readers' Questions on Physical Science:

Heat for Ice to Steam

The following 3 comments and questions have been sent in. They are listed according to date.

List of first 10 items

• Why does warm air rise?
• Can ice be changed directly into vapor?
• Specific heat capacity of steam

Next 10

Why does warm air rise?

Question

November 7, 2007

hi

excellent note plz tell me answer of my questions
Warm air rises because faster-moving molecules tend to move to regions of less?

objects that radiate relatively well, often do what:

rabeel - India

14725

Answer

The reason warm air rises is because it is less dense than cooler air, thus making it lighter. The higher energy of the molecules causes the warm gas to be less dense.

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Can ice be changed directly into vapor?

Question

March 8, 2007

can a given mass of ice be changed directly in to vapour?how?

pratik - Nepal

13327

Answer

Yes, you can see steam coming off of ice that is heated by the sun on a cold day. Also, see our lesson on the evaporation:
http://www.school-for-champions.com/science/evaporation.htm

And pressure and states of matter:
http://www.school-for-champions.com/science/matterstates_pressure.htm

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Specific heat capacity of steam

Question

December 19, 2005

why is specific heat capacity of steam less than ice and water ?

nastaran - iran

9422

Answer

The specific heat capacity is related to the density of the material. Water and ice are denser than steam.

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