How much does a pint of water weigh?

One US fluid pint of water weighs about a pound (16 ounces), resulting in the popular saying, "The pint's a pound, the world around." However, a US pint of water weighs 1.04375 pounds and the statement does not hold the world around because the imperial (UK) pint weighs 1.25 pounds. A different saying for the imperial pint is "A pint of pure water weighs a pound and a quarter."

https://en.wikipedia.org/wiki/Pint

Incidentally, 2 US pints would have a mass of almost 1 kilogram (actually 0.94636 kg), by virtue of approximating 1 litre: "One litre of liquid water has a mass of almost exactly one kilogram, due to the gram being defined in 1795 as one cubic centimetre of water at the temperature of melting ice. Subsequent redefinitions of the metre and kilogram mean that this relationship is no longer exact by definition." https://en.wikipedia.org/wiki/Litre

"L =US pt lqd / 2.1134" http://www.metric-conversions.org/volume/us-liquid-pints-to-liters.htm

The SI weight (a force) would be expressed in Newtons (N), found by multiplying the mass (in kg) by the acceleration of Earth's gravity (9.8 m/s/s) -see http://theory.uwinnipeg.ca/mod_tech/node25.html

Thus one US pint of water has a mass of 0.47318 kg, and weighs 9.8 x 0.47318 = 4.637164 N (or 1.04 pounds).

An Imperial pint is a bit larger, equivalent to 1.2 US pints, giving it a mass of 0.567816 kg and a weight of 5.5645968 N (or 1.25 pounds).