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Dekameter and Square Dekameter – A Short Note

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

1 dekameter = 10 meters

Dekameters are not commonly used in everyday life but can be helpful for measuring medium distances, such as the length of a swimming pool or a small field.

A square dekameter (symbol: dam²) is a unit of area representing a square with sides one dekameter long:

1 dam² = (10 m) × (10 m) = 100 m²

Square dekameters are used to measure areas like playgrounds, gardens, or small plots of land.

In summary:

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  Dekameter (dam) measures moderate lengths (tens of meters)

  
  
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  Square dekameter (dam²) measures moderate areas (hundreds of square meters)

  
  
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  Occasionally used in land measurement and construction

  
  

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.