PHYS320 Lab 20 Temperature and Heat
Experiment 1: Thermometer
1. What happened to the straw water level when you ran the warm water over the bottle? Why does this happen?
2. What happens to the water level when you placed the thermometer in a cold setting? Why does this happen?
3. What do your answers demonstrate about the air pressure inside the bottle? Why is it important that the top of the bottle is sealed around the straw?
4. Would your thermometer work if the bottle was completely full of water? How do you think mercury thermometers work without air (think about the diameter of a mercury thermometer vs. the diameter of your straw)?
Experiment 2: Thermal Expansion and Contraction
1. What happened to the temperature of the rubber band after stretching it? Does this indicate that stretching the band adds energy or subtracts energy from the rubber? Explain this in terms of work done on and by the band.
2. What happened when you heated the center of the rubber band?
3. Create a hypothesis explaining what is happening to the molecules of the rubber as it is heated and cooled.Experiment 3: Specific Heat
1. The heat lost by the hot bolt is equal to the heat gained by the water in the calorimeter. Use the equations provided above and what you know about heat to solve for the specific heat (C1 ) of the steel.
2. What is the specific heat of steel from Table 1? Find the percent error for your calculated specific heat relative to this accepted value.
3. Comment on your percent error. How could you improve the experiment to reduce this error?
4. Does the air inside the calorimeter also gain heat? Why do we exclude this from our calculation?
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