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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.

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