1 litre of water at its densest point, that is 4C (or around 277K)! This is why the bottom of lakes are often at 4C (with a specific gravity of 1.00000).
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Then what is liter?
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10^-3 m^3
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as well as speed of light and gravity constant. the three natural constants can redefine mass, length and time unit
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Why was the liter of water not accurate enough? Depended too much on the amount of isotopes?
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Density of water changes under different pressures and temperatures.
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Another for you @Char_Wicks
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This Tweet is unavailable.
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Plancks constant or Avogadro's constant?
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Un decimetro cubo di acqua distillata a 4 gradi centigradi a Sevres.
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It was originally defined as the mass of a liter of water at its freezing point. Today it is equal to the mass of a prototype artifact stored in France.
A new definition using the Planck constant will relate it to the definition of the second and the meter
A second is the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the Cesium-133 atom.
It was originally defined as the fraction 1/86,400 of a mean solar day.