LPG Shortage: Why does LPG smell strong despite being odourless in nature?

Amid concerns over LPG shortage, many are wondering about the science behind the cooking gas used in everyday life. While LPG is naturally odourless, a strong smell is deliberately added for this reason.

LPG Crisis continues People queue up at Gas centres top leaders stage protests — Image credit:

LPG Crisis continues: People queue up at Gas centres, top leaders stage protests

LPG crisis continues as people are seen waiting for gas at centres, while several leaders stage protests.

Rising LPG concerns put pressure on kitchens as availability becomes uncertain — Image credit:

Rising LPG concerns put pressure on kitchens as availability becomes uncertain

LPG (cooking gas) has become a major topic of discussion everywhere—from households to public forums.

Did you realize that the natural gas utilized in cooking is completely odourless — Image credit:

Did you realize that the natural gas utilized in cooking is completely odourless?

LPG is naturally odourless, meaning it has no smell in its pure form. If this gas were supplied without any added substance and a leak occurred, it would be almost impossible to detect. This raises an important question—what is added to LPG to give it that sharp, foul smell, and what is the science behind this safety feature?

Science or Magic What is added to LPG to give it that sharp foul smell — Image credit:

Science or Magic, What is added to LPG to give it that sharp, foul smell?

Real reason revealed behind sharp, foul smell

Why odourless gas can be dangerous — Image credit:

Why odourless gas can be dangerous?

LPG (Liquefied Petroleum Gas) is basically made of two different gases (propane and butane) mixed together to form one gas. It is odourless in its pure state, which means that if you have a gas leak, you won't smell it.

How a colourless odourless gas is made safe — Image credit:

How a colourless, odourless gas is made safe?

Because LPG is heavier than air and highly flammable, if there is an undetectable leak, it is very dangerous - just like a ticking time bomb. To reduce this kind of life-threatening risk, each time LPG is produced, a certain additive is mixed in with the gas to allow for an easy detection of possible leaks in the future.

What causes the strong smell in LPG — Image credit:

What causes the strong smell in LPG?

The distinctive rotten smell you notice during a gas leak does not come from LPG itself, but from a chemical compound added to it called ethyl mercaptan (also known as ethanethiol). This is a colourless gas with a very strong and pungent odour. Scientists chose this substance because even a tiny amount can be easily detected by the human nose, making it an effective safety feature to quickly identify gas leaks.

LPG Gas Leak — Image credit:

LPG Gas Leak

Even a minor leak from a gas cylinder or pipeline allows this chemical to mix with the air and quickly reach your nose, alerting you to the danger. LPG leaks are particularly hazardous because the gas can accumulate in enclosed spaces, displacing oxygen and creating a highly flammable environment. On coming into contact with a spark or flame, it can lead to a powerful explosion. Without the addition of mercaptan, such leaks might go unnoticed until it is too late.