Which method of level measurement uses hydrostatic head, weight, and density?

The correct method of level measurement that uses hydrostatic head, weight, and density is pressure measurement. This method is based on the principle that the pressure at a given depth in a fluid is directly proportional to the height of the fluid column above that point, the density of the fluid, and the acceleration due to gravity.

In practical terms, this means that a pressure sensor or transducer can be employed at the bottom of a tank to measure the pressure exerted by the liquid above it. By knowing the density of the fluid, one can utilize the hydrostatic pressure to calculate the level of the liquid within the tank. This method is effective for various applications, such as monitoring fluid levels in tanks and other containment vessels where the weight of the fluid column generates pressure.

The other methods mentioned, like point, inferential, and direct measurements, do not primarily rely on the concept of hydrostatic head in the same way. Point measurement typically refers to sensors that determine level at a singular point without utilizing hydrostatic principles, while inferential methods often employ indirect measures to estimate level rather than direct pressure calculations. Direct methods, while they can involve a direct measurement of level, may not utilize hydrostatic principles effectively as does the pressure method. Thus, pressure