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Yes there is. To fill a 1 liter bottle with hot water, you will use a smaller amount of liquid than if you did the same thing with cold water. It’s just that the heated liquid is less dense. “That is, it occupies more space, because, with the increase in temperature, the molecules become more agitated and the space between them increases”, says chemist Jorge Masini, from USP. The question is a bit reminiscent of another classic trap, which asks: which weighs more, 1 kilo of iron or 1 kilo of feathers? In this case, of course, they both weigh the same. The difference is that iron, which is denser, occupies a much smaller volume than feathers. With water, the same thing happens. As the liter is not a measure of weight, but of volume, a denser liquid will always take up less space. In practice, 999.973 grams of water at 4°C make up 1 liter. With the same liquid at 30 °C, 995.944 grams would suffice: a significant difference of 4 grams.