Liquid with Lower Density than Petrol: Non-Fuel Options

[M.Kalai vanan]

Is there any liquid that has lower density than petrol.
one more point : it should not be a fuel.Is there any?

 

[Borek]

Liquid helium.

 

[DrDu]

Liquid helium.

Borek, I fear this forum is slowly mutating you into a physicist!

 

[Borek]

 

[M.Kalai vanan]

thanks.
But liquid helium doesn't exist in liquid form in room temperature.
Is there any other liquids less dense than petrol and exists as liquid in room temperature.

 

[Borek]

You are moving goalposts now

And I am not convinced you told us all. What will be the next condition? And what does it mean "not a fuel"?

Not that I can think of any substance that is liquid at RTP, has a density around 0.7 g/mL and is not a hydrocarbon.

 

[DrDu]

How about Hydrogen cyanide? Boiling Point 25 deg. Celsius, Density 0.68 g/cm^3. Not used as a fuel as far as I know although it is highly inflammable. It is used both as a reactant and a solvent in the Gattermann synthesis.