1. Chapter 4: Temperature describes how hot or cold an object is.

2.  How does temperature affect your daily life?  Why do you feel warm playing outside on a cold winter’s day?

3.  A description of how hot or cold something is.

4.  4-1A Boiling Hot, Freezing Cold p. 111

5.  Room Temperature – 22 o C  Body Temperature - 37 o C  Boiling Point of Water - 100 o C  Freezing Point of Water - 0 o C

6.  Read p. 115 – 116  Reading Check p. 116 #1-3

7.  P. 119  #6, 7, 8, 9

8.  Early Thermometers  Galileo's Air Thermometer ▪ As the air heats, the liquids drops and rises when air is cooled.

10.  Early Liquid Thermometer:  Liquid rising up the tube shows the temperature is rising.

11.  Scales are necessary for temperatures to be accurate and comparable.  3 commonly used scales are: 1.Fahrenheit 2.Celsius 3.Kelvin

12.  Developed by Daniel Fahrenheit  The first to be widely used  Freezing of water occurs at 32 o F  Boiling of water occurs at 212 o F

13.  Developed by William Thomson (Lord Kelvin)  Scale states that the coldest temperature possible –absolute zero (-273 ˚C)

14.  Developed by Anders Celsius  Most commonly used temperature scale  Based on water freezing at 0 o C and boiling at 100 o C.

16.  To calibrate means to accurately assign a scale. Steps to calibrating a Thermometer 1. Place the bulb in a mixture of water and ice. 2. Mark the point at the top of the liquid as 0 o C. 3. Remove the bulb from the ice water and place in boiling water. 4. Mark the point at the top of the liquid as 100 o C 5. Divide the space between 0 and 100 into 100 even spaces. Each space will represent 1 o C.

17.  Liquid in Glass Thermometer  The lab thermometer contains colored alcohol rather than mercury for safety.

18. The Thermocouple  Made of two wires of different metals.  A temperature difference causes a current to flow through the wires. This current is measured by a meter.  Can measure higher temperatures than typical thermometers.

21.  Made of two different metals fused together.  These metals expand and contract at different rates causing the strip to bend when heated.

23.  Converts infrared radiation into colors that can interpret a temperature difference.

24.  P. 131  #2, 3, 5, 6, 8, 12  P. 132 - 133  #2, 10, 11, 15, 16, 18, 19