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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.

Gal – A Short Note

The Gal (symbol: Gal) is a unit of acceleration used primarily in geophysics and gravimetry to measure gravitational acceleration. It is named after Galileo Galilei, the famous Italian scientist who studied motion and gravity.

The Gal is defined as:

1 Gal = 1 centimeter per second squared (1 cm/s²)

This means an object accelerating at 1 Gal gains 1 cm/s in speed every second.

Because the Gal is relatively large for precise measurements, smaller units are commonly used:

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  1 milligal (mGal) = 0.001 Gal

  
  
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  1 microgal (µGal) = 0.000001 Gal

  
  

Earth’s gravity at the surface is approximately 980 Gal, but geophysicists often measure small variations in gravity, so they typically use milligals or microgals.

The Gal is not an SI unit, but it is widely used in scientific fields related to the Earth, such as seismology, mining, and oil exploration.