Question

What is the use of gas releasing pin in the bomb?

(a) To remove the oxygen gas from the bomb

(b) To release the pressure from the bomb

(c) To release the water vapour

(d) To remove the carbon containing gases (such as CH4, CO2 etc)

This question was addressed to me in examination.

Query is from Determination of Calorific Value of Solid and Non-Volatile Liquid Fuels topic in division Fuels and Combustion of Engineering Chemistry II

Answer 1

Right choice is (b) To release the pressure from the bomb

The explanation is: The pressure required in the bomb should be constant, so as to measure the change in enthalpy of the solution. Sometimes when the value of pressure is increased above to the suitability of the bomb, then to keep the pressure constant gas releasing pin is used.