Direct measurement is when an object or something can be directly measured, meaning that you can actually pick it up and measure the sides (such as a box) Something that wouldn't be classified to be directly measured is something like a rock, where you need to use Indirect measurement to measure it, like dropping a rock in a container with water, and see how much the water rises.
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It is indirect measurement. A thermometer, for example, measures the expansion of an appropriate fluid - alcohol or mercury. Some instruments (thermocouples) measure the differential expansions of metal strips
there are two types linears measurements 1)direct 2) indirect
The CRT display becomes an electronic graph of two instantaneous voltages. The display may be a direct comparision of two voltages such as during phase measurement, or frequency measurement with Lissajous waveforms.
Because it is a very common form of mathematical relationships, for example, in very many conversions from one measurement unit to another.
the smallest measurement in the us