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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.

Centimeter and Square Centimeter – A Short Note

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

1 centimeter = 10⁻² meters (0.01 meters)

Centimeters are widely used to measure everyday objects like the length of a pencil, the width of a book, or the height of a small plant.

A square centimeter (symbol: cm²) is a unit of area that represents a square with sides one centimeter long:

1 cm² = (10⁻² m) × (10⁻² m) = 10⁻⁴ m²

Square centimeters are commonly used to measure surface areas of small objects, like the size of a photograph, a piece of fabric, or the area of a label.

In summary:

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  Centimeter (cm) measures lengths at a human-scale level

  
  
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  Square centimeter (cm²) measures areas of small to medium-sized surfaces

  
  
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  Used frequently in education, crafts, science, and everyday measurements