Which two factors determine the static head pressure close to the bottom of a tank?

The static head pressure at the bottom of a tank is primarily determined by the height of the liquid level above the point of measurement and the specific gravity of the liquid. The height of the liquid level directly affects the pressure exerted on the bottom of the tank due to the weight of the liquid. As the level increases, there is more liquid above, leading to greater pressure.

Specific gravity is a measure that compares the density of a liquid to the density of water. This factor is crucial because liquids with different specific gravities will exert different pressures at the same height. For example, a heavier liquid (higher specific gravity) will create more pressure at a given height than a lighter liquid (lower specific gravity). Thus, both the height of the liquid and its specific gravity are the two factors that determine the static head pressure in such a scenario.

Other factors like acidity or alkalinity, turbidity, and viscosity may affect the characteristics and behavior of the liquid but do not directly determine the static head pressure.