How to measure the volume of your bathtub: - Fill with cold water - Heat electrically with known constant power - Measure rate of temperature change
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I'm sure you're only half-kidding here, given your current lack of piped hot water, but what about ambient losses? ;) Maybe measure the rate of cooling too?
#pedantic
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Walls and air are warmer than the water btw, so diffusion should actually heat it up. Evaporation otoh will cool it down. But I don't expect much evaporation under the conditions I have.
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