1.3 - temperatures in Kelvin. Include the boiling point of liquid helium.
1.8 - linear thermal expansion coefficient
1.10 - number of gas molecules in an average room
1.12 - distance between gas molecules
1.14 - mass of a mole of dry air
1.16 - exponential atmosphere
1.22 - effusion of gas through a small hole
1.23 - thermal energy in a liter of helium
1.25 - degrees of freedom for a water molecule
1.28 - microwaving a cup of water