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);
It's generally not a good idea to prepare the injection in front of the person (turning your body to hide it in a flu clinic setting). It truly is an art form IMO. Knowing where to inject is key for example many meds are only for deep muscle injections therefore not suitable for the deltoid. Know your meds.