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It is defined as the pressure exerted by a column of water of 1 inch in height at defined conditions. At a temperature of 4 °C (39.2 °F) pure water has its highest density (1000 kg/m 3). At that temperature and assuming the standard acceleration of gravity, 1 inAq is approximately 249.082 pascals (0.0361263 psi). [2]
The specific weight, also known as the unit weight (symbol γ, the Greek letter gamma), is a volume-specific quantity defined as the weight W divided by the volume V of a material: = / Equivalently, it may also be formulated as the product of density, ρ, and gravity acceleration, g: = Its unit of measurement in the International System of Units (SI) is newton per cubic metre (N/m 3), with ...
Avoirdupois pound per cubic inch (1 g/cm 3 ≈ 0.036127292 lb/cu in) ... Water – Density and specific weight; Temperature dependence of the density of water ...
A fuel station in the United States displaying fuel prices per US gallon. The US liquid gallon (frequently called simply "gallon") is legally defined as exactly 231 cubic inches, i.e. 3.785411784 litres. [6] [7] A US liquid gallon contains 3.785411784 kilograms (8.3454 lb) of water at 3.98 °C (39.16 °F), making it 83.26742% of an imperial gallon.
[14] [15] Otherwise, water hardness is measured in the dimensionless unit of parts per million (ppm), numerically equivalent to concentration measured in milligrams per litre. [14] [15] One grain per U.S. gallon is approximately 17.1 ppm. [14] [note 1] Soft water contains 1–4 gpg of calcium carbonate equivalents, while hard water contains 11 ...
The acre-foot per year has been used historically in the US in many water-management agreements, for example the Colorado River Compact, which divides 15 million acre-feet per year (19 cubic kilometres per year) among seven western US states. Water reservoir capacities in the US are commonly given in thousands of acre-feet, abbreviated TAF or KAF.
Water is the chemical substance with chemical formula H 2 O; one molecule of water has two hydrogen atoms covalently bonded to a single oxygen atom. [26] Water is a tasteless, odorless liquid at ambient temperature and pressure. Liquid water has weak absorption bands at wavelengths of around 750 nm which cause it to appear to have a blue color. [4]
the weight of 35 cubic feet (0.991 m 3) [2] of salt water with a density of 64 pounds per cubic foot (1.03 g/cm 3) [1] Usage around the world. United Kingdom