3. Suppose a new liquid were discovered that is identical to water in every way except that
it has a lower latent heat of fusion. Would it take a longer or shorter time to make ice
out of this liquid in your freezer? Why?
4. A great amount of water vapor changes phase to become water in the clouds that form
a thunderstorm. Does this release thermal energy or absorb it? Explain.
Quantitative Practice
5. Steam at 100°C is added to ice at 0°C. Find the temperature when the mass of steam is
10 g and the mass of ice is 50 g. The specific heat of water is 4186 J/kg°C, its latent heat
of fusion is 3.33x105 J/kg and its heat of vaporization is 2.26x106 J/kg.