Gases liquids
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Gases & Liquids. Plant Physiology UNI Spring 2009. Properties of gases & liquids. Properties of gases & liquids. Properties of gases & liquids. Properties of gases & liquids. Properties of gases & liquids. Properties of gases & liquids. Properties of gases & liquids.

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Gases & Liquids

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Gases liquids

Gases & Liquids

Plant Physiology UNI

Spring 2009


Properties of gases liquids

Properties of gases & liquids


Properties of gases liquids1

Properties of gases & liquids


Properties of gases liquids2

Properties of gases & liquids


Properties of gases liquids3

Properties of gases & liquids


Properties of gases liquids4

Properties of gases & liquids


Properties of gases liquids5

Properties of gases & liquids


Properties of gases liquids6

Properties of gases & liquids


Properties of gases liquids7

Properties of gases & liquids


Properties of gases liquids8

Properties of gases & liquids


Properties of gases liquids9

Properties of gases & liquids


Properties of gases liquids10

Properties of gases & liquids


Quiz state pressure

Quiz—State & pressure


Demonstrations

Pull up

Demonstrations

Air

Liquid

What is holding up this part of the water drop?

Syringe sealed at bottom

What will happen to the liquid when we pull up?What happens to air & liquid pressures?


Acting out a gas

Acting out a gas

  • Student volunteers

  • Gas molecules don’t hold onto each other

  • Can compress if contained (can push) – big volume change

  • Can't pull (no connection between molecules)

  • Gases: can push but not pull

  • Gases: under positive pressure only


Acting out a liquid water

Acting out a liquid (water)

  • Same volunteers

  • Can push or pull: molecules bound to each other

    • Especially true for water

    • More like solid than like gas

  • Positive or negative P (“pressure” or “tension”)

    • Compression: P is +

    • Tension: P is - (like solid)

  • Must contain liquid to push (like gas)


Gas in liquid acting out in class

Gas in liquid—acting out in class

  • Same volunteers

  • Make the middle molecule a gas

    • Can push

    • Can't pull

  • Gas bubble is called embolism

    • may occur naturally

  • Embolisms stop transport based on pulling


Archaic use of tension

Archaic use of “tension”

  • Hypertension, oxygen tension in blood, high tension electrical wires

  • “Tension” was used to mean + pressure

    • Still use this sense in medicine

  • Gas pressure can be lower than atmospheric, but that is still positive

    • Low pressure is positive

    • Vacuum is zero pressure

    • No negative pressures in gases


Water gas liquid solid

Water: gas, liquid & solid

  • Life mostly water: properties critical

  • Boil or evaporate: big change in volume

  • Small volume change when we make ice

  • Polar molecules

    • Not stuck together in gas

    • Stuck together loosely in liquid

    • Stuck together tightly in solid


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