Is our sense to hotness and coldness trustworthy? How do we define temperature? How do we measure temperature in different situations? What factors determine the change in temperature of a body? You may find some hints to these questions just by boiling water and cooking in the kitchen!
Again we go into the kitchen to see how energy is transferred by different means of heating. Designing your solar cooker to heat up water to a high temperature sounds interesting, but a similar process of runaway greenhouse effect may bring a disaster to the life on earth!
A lot of energy is involved in changing ice into water, and water into steam. These phenomena have many interesting implications in our daily life. The vaporization of water in sweating and breathing helps to cool down our body on a hot day and maintain our body temperature normal.
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