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);
Types of Injections. For an intramuscular injection, a needle is inserted with a quick thrust at a 90-degree angle. The needle penetrates the skin and subcutaneous tissue, and the medicine is deposited in the underlying muscle. The deltoid muscle in the upper arm is the preferred injection site for adults.