International units of energy are expressed in?
They are not expressed in joules, they are expressed in volts.
No real difference. Ionization potential is the old name for ionization energy. However they are usually expressed in different units: - ionization energy is in units of joules or electron volts (eV) - ionization potential is in units of volts (e.g. an ionisation potential of 5V means that 5eV of energy needs to be supplied to the electron ionise it). ('Potential' is simply the energy needed per unit of charge.)
The official (international) unit for energy is the joule. Other units frequently used include the calorie, the electron-volt. In general, by the definition of work (which is basically energy) as force x distance, any product of units of force and distance can also be used, for example the foot-pound.
This issue is confusing. For Vitamin D, apparently 1mcg (that's 1/1000th of a milligram, or 1 millionth of a gram) is 40 international units. So the 'standard' adult dose of 400 units is actually 10 micrograms of the active component in the formulation. It seems that for different nutrients the number of units may differ (?). Does that make sense? Not to me! Hope this was helpful. because blood values are expressed as ng/mL, then…