How Much Does a Gallon of Water Weigh?
One gallon (US) of water, at room temperature, weighs approximately 3.78 kilograms or 8.33 pounds. According to the water density level, the precise weight of it differs. Water density depends on its storage temperature.
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How Much is a Gallon of Water?
We need to be clear about what a gallon actually is if we’re talking about the weight of a gallon of water.
In the United States, a gallon is equivalent to 128 fluid ounces or 3.785 liters.
In the United Kingdom, however, a gallon is equivalent to 160 fluid ounces or 4.546 liters.
In this article, we are going to focus on the American gallon [128 fl oz].
How Much Does Water Weigh?
People usually go by the rule that a liter of water weighed a kilogram. The beauty of the metric system is in its tidiness: 1 cubic centimeter of water is 1 milliliter and weighs 1 gram. So 1 liter of water [1000 milliliters] weighs 1 kilogram [1000 grams].
What is the Weight of 1 Gallon of Water?
A United States gallon of water weighs approximately 8lb, but the precise measurement really depends on a couple of environmental aspects that we will walk you through now.
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What Changes the Weight of Water?
As you are aware, water can change its state from boiling water on the hob or freezing it into cubes. These are extreme examples, but even mild changes in temperature do have an impact on the behavior, and thus the weight, of water.
Likewise, as the weight of water would be different at the bottom of the ocean, on land, or on the moon, atmospheric differences have an effect on its mass.
How Does Temperature Affect the Weight of Water?
Energy increases when water is heated up. An increase in temperature caused the water molecules to accumulate energy and move faster, which results in water molecules that are farther apart and an increase in water volume. So, the amount of space each molecule now requires is greater. Hence, increasing the energy [i.e. heat] of water decreases its density, and molecules become more spaced out.
Accordingly, if you have a gallon pitcher that you fill with cold water from the tap, it will weigh more than a pitcher of boiling water. More molecules fit in a given space [the gallon pitcher] than would be in the hot water because the density of the cold water is greater. In other words, hotter water weighs less, and colder water weighs more.
Using a pint glass, an experiment was made, and the result was that a pint of cold water weighed 560g, but a pint of hot water weighed just 530g. So, less hot water fits in the glass.
Find out here how to convert Cubic Yards to Cubic Feet
How Much Does a Gallon of Water Weigh?
Water is most dense when it is at 4ºC or 39.2ºF. A gallon of water, at this temperature, weighs approximately 8.345lb. If you turn the heating way up to 200ºF, then a gallon of water will weigh about 8.04lb. At room temperature [21°C or 70°F], a gallon of water weighs 8.33lb [3.78kg].