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Inch and Square Inch 

An inch is a unit of length commonly used in the United States and other countries following the imperial system. It is equal to 1/12 of a foot or approximately 2.54 centimeters. Inches are typically used to measure small distances or dimensions, such as the size of a screen or the height of an object.

A square inch (written as in²) is a unit of area that represents a square with sides that are one inch in length. It is used to measure surface area, such as the area of a piece of paper, a screen, or a section of flooring. One square inch equals 6.45 square centimeters.

While inches measure one-dimensional length, square inches measure two-dimensional area. Understanding the difference between the two is important in fields such as construction, design, and manufacturing where both length and area are frequently calculated.

Galileo (Unit) – A Short Note

The galileo (symbol: Gal) is a unit of acceleration used mainly in the field of geophysics, especially gravimetry, which measures the Earth's gravitational field.

One galileo is defined as:

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

It is a non-SI (non-International System) unit, named after the Italian scientist Galileo Galilei in honor of his pioneering work on gravity and motion.

Because the Gal is a relatively large unit for precise gravity measurements, smaller subunits are often used:

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  1 milligal (mGal) = 0.001 Gal

  
  
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  1 microgal (µGal) = 0.000001 Gal

  
  

In practical terms, Earth's surface gravity is about 980 Gal, but variations in local gravity fields (due to terrain, density, etc.) are often measured in milligals or microgals.

The galileo unit is essential in geophysical surveys, oil exploration, and earthquake studies.