1. a shed or shelter. 2. any relatively wide structure used for housing airplanes or airships. *haimgard fence around a group of buildings = haim small village (see hamlet) + gard yard 2 ]. - Simply meant shed for carriages when it came into English.
Molar concentration, also called molarity, amount concentration or substance concentration, is a measure of the concentration of a solute in a solution, or of any chemical species in terms of amount of substance in a given volume. A commonly used unit for molar concentration used in chemistry is mol / L.
1 Molarity (M.) The number of moles of a solute divided by the volume of the solution. A mole is a unit often used in chemistry to describe the number of atoms or molecules of a substance.  Parts per million (ppm.) The number of units (usually grams or milligrams) of a solute found in one million units of the solution.