7/25/2019 sci 1(18)

1/1

50. Question: Why is the water in an open pond cool even on a hot summer

day?

Answer: As the water evaporates from the open surface of a pond, heat is

taken away in the process, leaving the surface cool.

5. Question: Why is it less di!cult to cook rice or potatoes at higher

altitudes?

Answer: Atmospheric pressure at higher altitudes is low and "oils water

"elow 000#. $he "oiling point of water is directly proportional to the

pressure on its surface.

5%. Question: Why is it di!cult to "reathe at higher altitudes?

Answer: &ecause of low air pressure at higher altitudes the 'uantity of air is

less, and so that of o(ygen.