Water Cycle - Atmosphere (2)
Lab 


PROBLEM: Does air exert pressure?

PREDICTION:

EXERCISE 1.
MATERIALS: plastic clear glass, water, card

  1. fill cup with water
  2. put card on top
  3. turn cup upside down quickly fill glass water

Describe what happens.

EXERCISE 2.
MATERIALS: piece of paper, straw

  1. put paper against one end of straw
  2. suck through the other end

Describe what happens?

EXERCISE 3.
MATERIALS: straw, plastic glass of water

  1. take straw, put finger on one end
  2. Push the other end into glass of water.
    Describe what happens? 
        
  3. put straw in without finger on top
  4. put finger on top and remove straw
Draw what happens.

EXERCISE 4.
MATERIALS: plastic glass, paper towel, pan of water

  1. put an upside down glass with a paper towel in a pan of water
  2. put one glass filled with water upside down in water, put an empty glass next to the other
  3. tip the empty glass next to the glass with water as in the diagram. What happened after #2? 
    What happened after #3?
Give examples of how air exerts pressure.

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