Question

if gas is invisible, how can you tell when the gas leaks?
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Answer 1

Answer:

smell helps us to know that gas is leaking

Explanation:

thank you

Answer 2

Answer:

Gas is a physical state of matter, and as we all must know by heart, 'Matter has mass and occupies space.'

So, gas being matter has mass, even though not visible, and also has volume and density. Any change in these quantities, let us know that the gas has leaked.

Moreover, in case the gas is not odourless, we can obviously know that the gas has leaked when its odour spreads.

Also, many gases possess colour and other visible characteristics, such as minute particles, or how dense the gas is, which makes it easy to notice gas leaking.