At the end of a warm summer day, imagine you are jumping from the 80°F air into an 80°F swimming pool. Use what you have learned about thermal energy and heat flow to explain which direction heat from your body flows in the air and in the water, and why the pool feels cooler than the air. (10 points) Think about the temperature of your body and the factors that determine whether a substance makes a good thermal conductor.

Explanation:

The normal temperature of the body is about 98ºF.

1. Heat direction

The thermal energy always flows from the warmer bodies to the colder bodies. Thus, the heat from your body flows toward the air or the water.

                   heat flow

        98ºF                               80ºF

      warmer                           colder

2. Why the pool feels cooler than the air?

Water has a high specific heat capacity. That makes that, for a given amount of heat, it will change its temperature little.

When your body is in water the heat of your body will flow to the water and while the themperature of the water changes little the temperature of your body changes more, in the same time. This is, the rate of cooling of your body is higher than the rate of cooling of the water.

When you compare what happens in air, since air has a lower specific heat capacity, the rate of cooling of your body is lower than in water.

Then, the temperature of your body will decrease faster in the water than in the air, which is what you interpret (feel) as the pool is cooler than the air.

answer; /// i do believe that the correct answer is (c)nuclear bond

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.