Your Own Barometer
straw (clear plastic)
or cork stopper which fits in the neck of the bottle Instructions
a drinking straw into the bottle.
the bottle about half-way full of water.
the neck of the bottle around the straw either with the rubber stopper
or a cork.
sure the end of the straw is immersed in the water and that the
water level in the straw is above the top of the bottle.
air pressure outside the bottle decreases, the trapped air inside
the bottle will push the water up the straw. As the air pressure
outside the bottle increases, it will push the water farther down
Note: You'll need to keep your barometer's temperature constant,
since temperature will also affect the water level.