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Since world war 2 meteorologists have used weather balloons to provide profiles of temperature. There are over 70 launching sites in this country, there are more than 700 other sites around the world. They realease them at the same time and the data is sent to a computer in Maryland here in the US. The rubber balloons are filled with helium or hydrogen to a diameter of 2 m. An instrument package is attached to each balloon by a 15-m cord. AS the atmospheric pressure decreases the gas inside th3e balloon expands carrying the balloon higher. when it reaches a height of 30 km the colume of the expanded gas is so great that the balloon bursts. then a parachute carries the package containing the radio transmitter and measuring instruments safely to the ground.

questions

1) because the weather balloons are more accurate. 2)because he is a meteorologist and its part of his job if he doesnt know about gas laws he wont be able to do his job and will be fired