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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.

Hectometer and Square Hectometer – A Short Note

A hectometer (symbol: hm) is a unit of length in the metric system, equal to:

1 hectometer = 100 meters

Hectometers are not as commonly used in everyday measurements but can be useful for measuring medium-large distances, like the length of sports fields or large plots of land.

A square hectometer (symbol: hm²) is a unit of area representing a square with sides one hectometer long:

1 hm² = (100 m) × (100 m) = 10,000 m²

Square hectometers are used to measure fairly large areas, such as farms, parks, or large property plots.

In summary:

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  Hectometer (hm) measures moderate lengths (hundreds of meters)

  
  
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  Square hectometer (hm²) measures substantial areas (thousands of square meters)

  
  
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  Used in land measurement and agriculture contexts