It is very important that you say which gas you mean. Some are dangerous, toxic, to us chlorine for example but there are other gasses that are essential, such as oxygen.
It can leak
NO
Yes, methane, a dangerous greenhouse gas.
A fermi gas is a model from quantum mechanics first proposed by Fermi. A neutron star is said to be an example of a Fermi gas, and that would indeed be a dangerous place.
Ozone
chlorine gas
very dangerous
mustard gas tear gas poison gas
Farts
Yes
its combustible
It can leak
NO
yes it is
R 134 is freon gas. In small amounts, the exposure to freon gas is not dangerous. In larger amounts, freon can cause respiratory issues.
Yes, methane, a dangerous greenhouse gas.
A fermi gas is a model from quantum mechanics first proposed by Fermi. A neutron star is said to be an example of a Fermi gas, and that would indeed be a dangerous place.