schoolscienceproject.blogspot.in
Gas balance
Fix two plastic
bags to the ends of a piece of wooden beading about 18 inches long and let it
swing like a balance on a drawing pin. Pour some bicarbonate of soda and somevinegar
into a glass. It begins to froth, because a gas is escaping. If you tilt the
glass over one of the bags, the balance falls. The gas, which is given off
during the chemical reaction, is carbon dioxide. It is heavier than air, so it
can be poured into the bag and weighed. If you were to fill a balloon with the
gas it would never rise, and for this purpose other gases are used, which are
lighter than air.
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