You May Have Noticed That When You Get Out of a Swimming

question 30

Multiple Choice

You may have noticed that when you get out of a swimming pool and stand dripping wet in a light breeze,you feel much colder than you feel after you dry off.Why is this?

• A)The moisture on your skin has good thermal conductivity.
• B)Water has a relatively large heat capacity.
• C)This is a purely psychological effect resulting from the way in which sensory nerves in the skin are stimulated.
• D)The water on your skin is colder than the surrounding air.
• E)540 calories of heat are required to evaporate each gram of water from your skin,and most of this heat flows out of your body.

---

Definitions:

Buffer

A solution that resists changes in pH when acid or alkali is added, mainly composed of a weak acid and its conjugate base.

Chemical Equation

A symbolic representation of a chemical reaction, showing the reactants, products, and, in some cases, the direction of the reaction.

Carbon Dioxide

A clear, unscented gas resulting from the burning of carbon-containing compounds and the act of respiration, which plants use in the process of photosynthesis.

Water

A ubiquitous chemical substance with the formula H2O, vital for all known forms of life and used in a myriad of industrial processes.