A gas cylinder is a container used to store gases under pressure. The article from the BBC discusses the shortage of cooking gas cylinders affecting Indian migrant workers. However, it does not provide detailed information on how gas cylinders work.
Typically, gas cylinders are designed to store gases such as propane or butane, which are commonly used for cooking. The cylinders are made of metal and have a valve that allows the gas to be released when needed. The gas is stored under pressure, which is maintained by a regulator that controls the flow of gas.
The article does not provide specific information on the mechanics of gas cylinders, but it highlights the impact of the shortage on migrant workers. The shortage is attributed to the Iran war, which has disrupted the supply of cooking gas cylinders.