Recap chapter 3

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This lesson contains 14 slides, with text slides.

Lesson duration is: 45 min

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Recap chapter 3

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Cohesion and adhesion

Cohesion

Molecules of the same substance attract each other

- round shaped area

- e.g. the attraction between water molecules forming a droplet

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Adhesion

Attractive forces between molecules of different substances.

The result is a hollow area

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Liquid thermometer

* liquid thermometers

* clinical thermometers

capillary tube

reservoir

graduated scale

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Digital Thermometer

Works with a sensor.

Sensor converts temperature into an electrical signal

Electronics convert this signal into a number

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Phase transitions

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Temperature and movement

The higher the temperature the faster the particles move.

If they move faste enough then they can escape.

Below, you can see this happening when water starts evaporating.

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Boiling

The process by which evaporation occurs anywhere in the liquid.

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Recap chapter 3

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