As the temperature of water approaches freezing, it becomes less dense again (and therefore gets lighter). The tl dr version ("too long didn't read") is that hotter water weighs less, and colder water weighs more. The density of the cold water is greater, so more molecules fit in a given space (the gallon pitcher) than would be in the hot water. Therefore, 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. The amount of space each molecule now needs is greater, because they're spinning around, high-kicking and elbowing one another, instead of standing calmly in line. Basically, water molecules get excited and start bashing each other around like a crowd of rabid shoppers on Black Friday. When you heat up water, you increase its energy. How does temperature affect the weight of water? Similarly, just as the weight of water would be different on land, at the bottom of the ocean, or on the moon, atmospheric changes have an impact on its mass. These are extreme examples, but even moderate temperature fluctuations affect the behaviour, and therefore the weight, of water. What changes the weight of water?Īs you'll know from boiling water on the hob, or freezing it into cubes, water can change its state. So 1L of water (1000ml) weighs 1kg (1000g).Īnd wouldn't it be wonderful if it really was that straightforward? What is the weight of a gallon of water?Ī US gallon of water weighs around 8lb, but the exact measurement really depends on a couple of environmental factors that we'll walk you through now. Simple, huh? The beauty of the metric system is in its tidiness: 1cm³ of water is 1ml, and weighs 1g. People used to go by the rule that a liter of water weighed a kilogram. (We've got more on that insanity over here.)įor the sake of the question, ' How much does a gallon of water weigh?', we are going to focus on the American gallon (128 fl oz). In the UK, however, a gallon is 160 fluid ounces, or 4.546 litres. In the US, a gallon is 128 fluid ounces, or 3.785 liters. If we're talking about the weight of a gallon of water, we need to be clear about what a gallon actually is.
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