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Planck Mass

The Planck mass is a fundamental physical constant in theoretical physics, representing a natural unit of mass based on fundamental constants: the speed of light, gravitational constant, and Planck’s constant.

Its value is approximately 2.18 × 10⁻⁸ kilograms (about 22 micrograms).

The Planck mass is significant in quantum gravity and string theory, marking a scale where quantum effects of gravity become strong and classical physics breaks down.

Summary:

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  Approximately 2.18 × 10⁻⁸ kg (22 micrograms)

  
  
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  Derived from fundamental physical constants

  
  
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  Important in quantum gravity and theoretical physics

Dalton (Da)

The dalton, symbolized as Da, is a unit of mass used to express atomic and molecular masses.

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  It is equivalent to the unified atomic mass unit (u).

  
  
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  1 dalton = 1/12 the mass of a carbon-12 atom ≈ 1.66054 × 10⁻²⁷ kilograms

  
  
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  Commonly used in chemistry, biochemistry, and molecular biology to measure the mass of atoms, molecules, and proteins.

  
  

Key Facts:

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  1 Da ≈ mass of one nucleon (proton or neutron)

  
  
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  Used to describe molecular weights (e.g., a protein might be 50,000 Da)

  
  
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  Helps standardize measurements on atomic and molecular scales

  
  

The dalton provides a convenient, standardized scale for describing the masses of tiny particles in science.