You want an abbreviation for a four letter word? How lazy are you anyway?
In chemistry and physics, the usual symbol for work in an equation is W or Q.
The contraction for "who is" = who's. It is not called an abbreviation.
There are a number of possible meanings for the abbreviation TWL. Some of these include Tournament Word List, The Weakest Link, Total Weight Loss and Top Water Level.
The abbreviation HCTZ commonly stands for the pharmaceutical drug hydrochlorothiazide. It is a diuretic which stops the kidneys from retaining water. In doing this it also is able to maintain ones calcium.
The abbreviation of electron is e−.
The abbreviation of "have not" is "haven't."
The molecular abbreviation for water is H2O.
The abbreviation for distilled water is H2O.
The medical abbreviation for water is H2O
It means: National Water and Sewage Authority
H2O
It doesn't have an abbreviation per se. Its atomic symbols is Na.NA
The contraction for "who is" = who's. It is not called an abbreviation.
The abbreviation for the term "potential of hydrogen" is pH. It is a measure of the acidity or alkalinity of a solution, including water solutions.
mt = mountain water
°C (Example: 0°C is the freezing point of water)
Dextrose 5% In Water (IV)
The abbreviation for deionized water is DI water. It is important in laboratory experiments because it is free of ions, which can interfere with chemical reactions and measurements. DI water helps ensure accurate and reliable results in scientific research.