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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Alternative: Fill with water, add a known amount of a strong acid or base and measure resulting pH.
That's a horrible way of measuring the volume, even by comparison to my method. :P The resulting pH would always just be extremely close to 7. Much better: Add known quantity of NaCl and measure electric conductivity.
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Just 10g H2SO4 in 100L H2O would have a pH of about 3. This method was actually used in ancient times.
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