It's one of the givens of kinetic molecular theory. It explains why hydrogen gas diffuses faster than carbon dioxide. Thus there is a greater probability that a lighter molecule like hydrogen will be able to cross a given transient empty space faster than a heavier one before the gap, so to speak, closes up.
(<60 kg) for IM injection in the deltoid muscle only if the subcutane-. ous tissue is not bunched and the injection is made at a 90Â° angle; a 1 needle is sufficient in adults weighing 130â152 lbs (60â70 kg);
However i was researching this for a reference to site hmm and to my surprise the following is acceptable: Deltoid: typical injection 0.5ml but up to 2ml, Dorsogluteal: Typical injection 1 to 4 ml, Ventrogluteal:1 to 4 ml, Vastus lateralis: 1 to 4 ml ( 1 to 3 ml for infants)