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Foot and Square Foot – A Short Note

A foot is a unit of length in the imperial and U.S. customary systems. One foot is equal to 12 inches or approximately 30.48 centimeters. It is commonly used to measure height, length, or distance—such as a person's height, the length of a room, or the size of an object.

A square foot (written as ft²) is a unit of area. It represents a square that is one foot long and one foot wide. One square foot is equal to 144 square inches or approximately 0.093 square meters. It is widely used in real estate, architecture, and construction to measure floor space, land area, or surface coverage.

In simple terms, a foot measures how long something is, while a square foot measures how much space it covers. Knowing the difference is essential when dealing with both length and area in everyday tasks or professional work.

Revolutions per Second (r/s)

Revolutions per second (r/s) is a unit of angular velocity that measures how many complete rotations or revolutions an object makes in one second. One revolution corresponds to a full 360-degree turn or $2\pi$ radians. This unit is commonly used to describe very fast rotational speeds in machinery, motors, turbines, and other high-speed rotating systems. For example, a motor spinning at 50 r/s completes 50 full rotations every second. Revolutions per second provide a clear and precise measure of rapid rotational motion, useful in physics, engineering, and technology fields where high-speed rotation is involved. It also facilitates easy conversion to other angular velocity units like radians per second or revolutions per minute.