schoolscienceproject.blogspot.in
Bottle
barometer
Stretch a piece
of balloon rubber over the mouth of a milk bottle and stick a straw on top of
it. As the air pressure varies daily according to the state of the weather, the
end of the straw moves up and down. When the air pressure is higher in fine
weather, the rubber is pressed inwards, and the end of the pointer rises. When
the air pressure falls, the pressure on the rubber is reduced, and the pointer
falls. Because the air in the bottle will expand if it is heated, the barometer
should be placed in a spot where the temperature will remain constant.
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