Three gallons’ weight is totally dependent on what is being measured and weighed. The most common answer to this topic is that one gallon of water weighs 8.34 pounds in the United States, hence three gallons weigh 25 pounds.
Because most liquids we use on a regular basis have a density close to water, we may assume that the weight will be similar to water. Other substances, such as sugar, have a different density. Three gallons of sugar weigh approximately 21 pounds.
Remember that the weight equals the density times the volume when determining the weight of three gallons of any substance.
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