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Pressure is directly proportional to temperature.
Except that:
1) You have to work in Absolute Temperature (Kelvin) To convert Celcius to Kelvin add 273. Eg 27 degrees C is about 300 K
Hence a 1 degree drop at 27 deg C changes the pressure by a factor of 1/300, which (assuming 200 bar in the tank) is 2/3 of a bar which is (200 x 1/300) = 0.66 bar (as previous posters said) You get a smaller drop in pressure for more empty tanks, and a higher drop for higher pressures of tanks
2) Also, things go screwy over around about 250 bar, and the laws become non-linear (ie pressure is no longer proportional to temperature)
Laters,
Janos
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