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Unit 2: Heat
Chapter 4: Temperature
describes how hot or cold an object is.
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How does temperature affect your daily life?
Why do you feel warm playing outside on a cold winter’s day?
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Place one hand in cold water, one hand in “hot” water for 1 minute. Then at the same time put both hands in the luke warm water. Describe what each hand feels.
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How hot or cold something is
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The human body
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Boiling point of water Freezing Point of water
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Comfortable room temperature
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1. Galileo’s Air Thermoscope:
As the air heats, the liquids drops and rises when air is cooled.
Early Thermoscopes...
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2. Early Liquid Thermometer:
Liquid rising up the tube shows the temperature is rising.
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Activity 4-1A“Building a
Thermoscope”Page 121
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Scales are necessary for temperatures to be accurate and comparable.
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3 commonly used scales are:
1.Fahrenheit2.Celsius3.Kelvin
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Developed by Daniel Fahrenheit
The first to be widely used
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Developed by Anders Celsius.
Based on the freezing and boiling points of water.
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Developed by William Thomson (Lord Kelvin)
Scale starts that the coldest temperature possible – absolute zero (-273 ˚C)
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1. The Liquid-in-glass Thermometer
The lab thermometer contains colored alcohol rather than mercury for safety.
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2. 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.
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Can measure higher temperatures than typical thermometers.
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3. The Resistance Thermometer (digital thermometers)
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4. Bimetallic Strip (thermostat)
Made of two different metals fused together.
These metals expand and contract at different rates causing the strip to bend when heated.
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Thermost
at
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Heating and Cooling a
Bimetallic Strip
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5. Infrared Thermometer (thermogram)
Converts infrared radiation into colors that can interpret a temperature difference.
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Can be used to measure heat loss in your home