1. Temperature: Put some hot water, warm water, and cold water in three bowls. Just use water from your faucet, and please be sure that the hot water is not too hot to touch! Place a finger in the hot water and a finger of the other hand in the cold water. After a few seconds, place them both in the warm water. Describe the sensations. Can you trust your senses for measuring temperature? Explain your answer.
The finger that was in the hot water sensed the warm water as cold, and the finger that was in the cold water sensed the warm water as hot. It shows that we cannot always trust our senses because the environment around us affects how we perceive things. 2. You know that the normal temperature for a healthy person is about 98.6 Fahrenheit degrees. Express this temperature in degrees Celsius. F = 1.8C + 32.
(F - 32)*5/9 = C
(98.6 – 32)*5/9 = C
66.6*5/9 = C
37 = C
3. What is happening to the average kinetic energy of the molecules in a pot of water when it is heated on a stove? Explain your answer.
Temperature is a measure of the average kinetic energy, so as the water in the pot heats up the average kinetic energy rises. 4. A metal rod is 25.000 cm long at 25.0 degrees Celsius. When heated to 102.0 degrees Celsius, it is 25.054 cm long. What is the coefficient of linear expansion for this metal?
ΔL=αLoΔT
ΔL = change in length
Lo = length at initial temperature
ΔT = change in temperature α = coefficient of expansion
