Helium is used to detect leaks.
When testing engine compression and cylinder leakage, the unit of measure commonly used is pounds per square inch (psi). Compression tests typically measure the pressure generated within each cylinder when the engine is cranked, while cylinder leakage tests quantify the amount of air escaping from the cylinder under pressure. Both measurements help assess the engine's health and efficiency.
M8 paper
The M256A1 Chemical Agent Detector Kit can detect nerve, blister, and blood agents, such as sarin, sulfur mustard, and cyanide, as well as certain toxic industrial compounds.
acetylcholine
Precipitation formsProduction of bubblesTemperature changeColor change
Helium is generally used; special spectrometers to detect helium leakage are designed.
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.
flux meter
You can do a cylinder leakage test to check for bent valves.You can do a cylinder leakage test to check for bent valves.
hydrogen sulphide...
gas detection cathrometers
A compound called mercaptan is added to LPG to detect its leakage. Mercaptan is a sulfur-containing compound that gives LPG a distinctive smell, making it easier to detect any leaks as it has a strong odor.
cylinder leakage
A chemical called Ethyl Mercaptan is added to LPG to give it a distinct odor, making it easy to detect leaks. This pungent smell is similar to that of rotten eggs, making any leak quickly noticeable to users.
When testing engine compression and cylinder leakage, the unit of measure commonly used is pounds per square inch (psi). Compression tests typically measure the pressure generated within each cylinder when the engine is cranked, while cylinder leakage tests quantify the amount of air escaping from the cylinder under pressure. Both measurements help assess the engine's health and efficiency.
If no signs of leakage at slave operating cylinder,then check clutch master cylinder for leakage,and look at clutch pedal and see if you see any clutch fliud as rod comes thru firewall.follow all lines.
ethanithiol ( IUPAC) ethyl mercaptan is added in lpg to detect leakage by the odour.