(IS 1209 (P:39) 1967)

The vapour pressure bomb is made of brass, heavily chromium plated, and consists of air chamber and gasoline chamber. A pressure gauge of required range is fitted above the air chamber. The joints are made leak-proof by neoprene washers. The water bath used is of such dimensions that the vapour pressure bomb is immersed to at least 1 inch above the air chamber and maintained at a constant temperature up to 80°C ±1°C, with FHP stirrer and PID digital temperature controller.