Helium is generally used; special spectrometers to detect helium leakage are designed.
gas detection cathrometers
hydrogen sulphide...
hydrogen sulphidte
Not sure about chemical? But there are highly sensitivity alarm metres for detecting the leakage of liquid petroleum gas (LPG, butane, propane etc), and natural gas. One method I once used to find a leaking joint on a gas cooker was to apply washing-up liquid round the joints until a joint bubbling up pin-pointed the leak.
Yes, Liquified Petroleum Gas is a Gas. It is a mixture of butane and propane. Also ethyl mercaptan is added to LPG to detect the gas leakage.
I have not heard of them being used for this. Canaries were however used to detect mine gas in the past.
Natural gas is odourless. Gas for domestic use - has chemicals added to create a smell, so leaks can be detected.
Ultrasonic leak detectors, are also referred to as acoustic gas leak detection systems. They are designed to detect gas leakage at outside facilities.
The union gas leakage held in 1984
It is used to detect the production of Gas by Microorganisms.
what should be our prime concern when dealing with volatile liquids and gas leakage
A gas syringe is basically a device that fills up with a gas that is produced and gives a volume for that gas. Gas from a reaction is forced into the syringe due to pressure and the syringe plunger is forced out (just like how you suck up a liquid with a normal syringe). It can be used to detect the volume of gas produced in a chemical reaction for instance.See the Web Links to the left for more information.