Helium is generally used; special spectrometers to detect helium leakage are designed.
hydrogen sulphide...
gas detection cathrometers
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.
The property of gas that helps us detect the leakage of LPG gas is its odor. LPG gas is odorless, but a foul-smelling odorant is added to it so that any leakage can be detected by smell. This distinctive smell alerts individuals to the presence of the gas and helps prevent accidents.
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.
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 property of gases that helps in detecting leakage of LPG gas is their odor. LPG gas is usually odorless, but a strong-smelling odorant is added to help detect leaks. This distinctive smell alerts individuals to the presence of gas in the event of a leak.
The union gas leakage held in 1984
Mercaptan, a sulfur-containing compound, is mixed with LPG (liquefied petroleum gas) to give it a distinctive odor for leak detection. This odor is often described as similar to rotten eggs and allows individuals to easily detect gas leaks.
Besides electronic detectors, there are 2 common means. The first is smell. A chemical- mercaptan- is added to LPG that gives it a horrible smell. The second is bubbles. Connections in piping can be checked for leaks with a soap solution. If it is leaking, it makes bubbles at the point of the leak.
The distinct smell of natural gas is due to the addition of a chemical called mercaptan, which is added to it before distribution for safety reasons. Mercaptan has a strong, sulfurous odor that makes it easier to detect a gas leak.