Recap chapter 3

Recap chapter 3
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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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