Sulphur Hexafluoride

[Ghoulish Delight]

Originally Posted by Alex Stroup

But it is still close to right to say it is heavier. The molar mass of air is 29g/mol. The molar mass of sulphur hexaflouride is 146 g/mol. So it is 6.13 times denser than air and 5.03 times heavier.

While it is heavier, that's not what people tend to mean when they say "heavier". Just because in this case the distinction is lost in terms of observable effect, doesn't mean they don't have distinct meanings.

[Alex]

I know the distinction, just pointing out that even though they weren't saying what they meant, what they said was still almost technically correct.