A weather balloon filled with hydrogen at 1 atm and `27^(@)C` has volume equal to 1200 litres. On ascending, it reaches a place where temperture is `-23^(@)C` and pressure is 0.5 atm. The volume of the balloon is

A weather balloon filled with hydrogen gas at 1 atm and 27^(@)C has volume equal to 12000 litres. On ascending , it reaches a place where temperature is -23^(@)C and pressure 0.5 atm. The volume of the balloon is :

A weather balloon filled with hydrogen at 1 atm and 27^(@)C has volume equal to 12000 litres. On ascending, it reaches a place where the temperature is - 23^(@)C and pressure is 0.5 atm. The volume of the balloon is "___________"

A weather balloon filled with hydrogen at 1 atm and 300K has volume equal to 12000 litres. On ascending it reaches a place where temperature is 250K and pressure is 0.5atm. The volume of the balloon is:

A thin balloon filled with air at 47^(@)C has a volume of 3 litre. If on placing it in a cooled room its volume becomes 2.7 litre, the temperature of room is: