Weight of a Gallon of WaterDate: 07/29/99 at 23:33:58 From: Shannon Harris Subject: Weight of one gallon of water I was trying to figure out how much a gallon of water weighed. I think it is 8 pounds, but would like confirmation if possible. Thank you in advance for your answer. Shannon Date: 07/30/99 at 12:52:22 From: Doctor Rick Subject: Re: Weight of one gallon of water Hi, Shannon. A gallon of water weighs 8.34 pounds. Your estimate is what many people remember as a rule of thumb. - Doctor Rick, The Math Forum http://mathforum.org/dr.math/ Date: 07/30/99 at 13:10:14 From: Doctor Fwg Subject: Re: Weight of one gallon of water Dear Shannon, One gallon (in volume) is equivalent to 3,785 cubic centimeters (i.e. 3,785 cm^3). If the density of water is assumed to be exactly 1.0 g/cm^3, then the mass of one gallon of water would be 3,785 g (from 3,785 cm^3 x 1.0 g/cm^3 = 3,785 g). And 3,785 g of water is equivalent to 8.346 lb. near the earth's surface because a 1,000 g mass near the earth's surface would weigh about 2.205 lb. However, the density of water varies somewhat with temperature and pressure, so the exact weight of a gallon of water might vary a little from the number I have given here because I have assumed that the water density is exactly 1.0 g/cm^3 and this is an approximation. I hope this answers your question. With best wishes, - Doctor Fwg, The Math Forum http://mathforum.org/dr.math/ |
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