Unit 2: Heat Chapter 4: Temperature describes how hot or cold an object is.

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Unit 2: Heat Chapter 4: Temperature describes how hot or cold an object is.

Transcript of Unit 2: Heat Chapter 4: Temperature describes how hot or cold an object is.

Page 1: Unit 2: Heat Chapter 4: Temperature describes how hot or cold an object is.

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