If you are using the unit kelvin, you are measuring the average

kinetic energy of molecules.

rate of reaction of particles.

mass of ionic compounds.

volume of a sample of gas.

If you are using the unit Kelvin, you are measuring the average KINETIC ENERGY OF MOLECULES.

Kelvin is the unit for measuring the absolute temperature of objects. Temperature refers to the degree of hotness or coldness of a body. The temperature of a body depends on the amount of heat that is applied to it, the amount of heat applied determine the value of kinetic energy that the particles of the body will possess; the higher the heat applied the higher the kinetic energy of the particles and vice versa.

some sources quote the lethal dose, for an average 170lbs opiate-naive individual is between 75 and 375 mg