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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

  
  

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.