We would use miles to measure the diameter of the earth because that is the greatest measure of length that is possible to measure something large.
The standard temperature is 0c.
the standard pressure is 1atm.
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The azimuthal quantum number (l) determines its orbital angular momentum and describes the shape of the orbital.
s-orbitals (for example 1s, 2s) are spherically symmetric around the nucleus of the atom.
p-orbitals are dumb-bell shaped. l = 0,1...n-1, when l = 1, that is p subshell.
d-orbitals are butterfly shaped.