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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.

Mile and Square Mile – A Short Note

A mile is a unit of length used mainly in the United States and the UK. One mile equals 5,280 feet or approximately 1.609 kilometers. It is commonly used to measure long distances, such as the length of roads, travel routes, or large-scale maps.

A square mile (written as mi²) is a unit of area. It represents the area of a square that is one mile on each side. One square mile equals 640 acres or approximately 2.59 square kilometers. It is often used to measure large land areas, such as cities, regions, or forests.

In summary, a mile measures distance (one-dimensional), while a square mile measures area (two-dimensional). The distinction is important in geography, land surveying, and transportation planning.