does a fluid ounce of water weigh an ounce
Fluid ounce The fluid ounce is distinct from the ounce as a unit of weight or mass, although it is sometimes referred to simply as an "ounce" where context makes the meaning clear, such as ounces in a bottle.
Fluid balance These outputs are in balance with the input of ~2500 ml/day.[9]
S'well The company sells bottles that hold 9 US fluid ounces (270 millilitres), 17 US fl oz (500 ml) or 25 US fl oz (740 ml). The bottles are reusable and include triple-walled insulation.[19][20] The manufacturer claims the bottles are non-leaching, non-toxic and maintain the content's temperature for 12 to 24 hours.[21][22]
Olympic-size swimming pool 2,500 m3 (88,000 cu ft) in cubic units. About 2 acre-feet.