Temperature, Heat, and Thermal Energy

How do particles move as they get warmer? Cooler?

Estimate: The temperature of the room. The temperature outside.

What do we learn when we read a thermometer?  This question will be answered throughout our study of temperature, heat, and thermal energy.

Activity  3 bulb thermometers  1 temperature sensing sheet (yellow dot)  1 temperature sensing sheet (red dot)  3 foam cups  Warm water  Cool water  Shallow pan  Towel or paper towels

What part of the thermometer actually senses the temperature?  The bulb at the end is the sensitive part  It contains alcohol, colored red; this expands as the temperature rises. The alcohol is forced into a very then tube that contains only a very small amount of alcohol compared with the bulb.

Is your hand warmer than the air in the room or cooler?  The thermometer in air reads about 22 C. Wrapping a hand around it raises it to about 30 C. Therefore, people are warmer than a typical room.

Measure the temperature of various things and record them in the chart Items Temperature (C) Air in the room Cold water Warm water Your hand

A temperature sensing sheet is another kind of thermometer. Its color is different at different temperatures. Describe the effect you have on each of the sensing sheets when you touched them.  Depending on the where you touch the paper (front or back), the color changes…..darker blue or violet. When you stop touching it, that area changes color back to the same as the rest of the sheet.

Study one temperature sensing sheet as it warms (when your hand touches it) and cools (after you release it). Is “brown” warmer than “green” or cooler?  Brown is cooler than green.

Using the same temperature sensing sheet, name 4 colors that it can be. Put those colors in order from warmest to coolest. TTTThe full range of colors from warmest to coolest are: VVVViolet, dark blue, blue, green, tan, brown, and black

How are the two sensing sheets the same and how are they different? EEEEach sheet is brown and tan when it is “cool” and blue when it is “warm”. Each sensor sheet has a different range of sensitivity. According to the “red dot” sheet, 25 C is “warm”; according to the “yellow dot” sheet, 25 C is “Cool”