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EXPERIMENT
2: Expansion of air Materials and tools: Ø<= span style=3D'font:7.0pt "Times New Roman"'> &nbs= p; An empty 2 litre plastic bottle Ø<= span style=3D'font:7.0pt "Times New Roman"'> &nbs= p; A rubber cork Ø<= span style=3D'font:7.0pt "Times New Roman"'> &nbs= p; A 6mm diameter plastic = tube (about 33cm long) Ø<= span style=3D'font:7.0pt "Times New Roman"'> &nbs= p; A 6mm diameter straw (s= traw nozzle) Ø<= span style=3D'font:7.0pt "Times New Roman"'> &nbs= p; A kettle and a stove or= any heating system Ø<= span style=3D'font:7.0pt "Times New Roman"'> &nbs= p; Water Ø<= span style=3D'font:7.0pt "Times New Roman"'> &nbs= p; A thermometer, a rubber= band, a pair of scissors, a needle (and a spirit burner) Method 1:= p> =
· =
span>Heat and stre=
tch the
straw to make a nozzle like figure 1. 2:= p> = · = span>Fold the straw like figure 2. =
· =
span>Make a hole with a needle. =
· =
span>Make an appro=
ximately
5mm longitudinal slit opposite side of the nozzle. =
· =
span>Make a hole i=
n rubber
cork and push the plastic tube. =
· =
span>Push the shor=
ter edge
of the tube into the straw nozzle.
Please heat water =
with
a kettle until it becomes about 70 degrees celsius. Put a basin under =
the
bottle and pour the warm water around the bottle. Warning: Please do not use boiling water Note: Warm water accelerate=
s the
speed of air molecules movement. The frequency of collisions between inner
surface of the bottle and air molecules increases. It is equivalent to the
increase of air pressure. Then expanded air in the bottle pushes water
outside of the bottle, so the water fountains out from the small hole of =
the
straw. |