Physics
If we want to calculate the pressure of a liquid at the bottom of a vessel, the quantity which is not required to determine it, is

Acceleration due to gravity at the bottom of the vessel
Height of the liquid column
Density of the liquid
Surface area of the bottom of the vessel

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Physics
The mass defect is the result of what action occurring?

Mass being converted to energy when protons and neutrons break apart in a nucleus
Mass being converted to energy when protons and neutrons bind together in a nucleus
Energy being converted into moles of atoms when neutrons break apart protons
Protons and electrons being attracted to each other

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