OK, If the tanks of your aeroplane only contain water, the capacitor gauges indicate:

a) a mass equal to zero

b) a mass of water different from zero, but inaccurate

c) the exact mass of water contained in the tanks

d) a mass equal to the mass of the same volume of fuel

answer b)

Surely, if the reference unit is also in the water, it will use the capacitance value of the water to work out the mass of the volume of water enclosed ???

a) a mass equal to zero

b) a mass of water different from zero, but inaccurate

c) the exact mass of water contained in the tanks

d) a mass equal to the mass of the same volume of fuel

answer b)

Surely, if the reference unit is also in the water, it will use the capacitance value of the water to work out the mass of the volume of water enclosed ???

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