The conversation between human and AI assistant.
Why is it that 1 litre of water weighs 1 kg while this doesn't apply for other liquids?
Oh, that's really interesting. Does that mean that if the temperature of the water changes, its weight might also change?
Yes, that's exactly right. The density of water changes slightly as its temperature changes, which can affect its weight. For example, one liter of hot water will weigh slightly less than one liter of cold water.