h (EN)

letter, symbol

letter “h”

1. the lowercase form of the letter "H"
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   The word "happy" starts with the letter "h".

symbol “h”

1. symbol for the hour (the unit of time equal to 60 minutes)
   The meeting is scheduled to last 2h.
2. Planck's constant (a fundamental constant in physics related to the energy and frequency of a quantum)
   In quantum mechanics, the value of Planck's constant (h) is crucial for calculating the energy levels of electrons in an atom.
3. hecto- (a symbol used in measurements to denote a hundredfold increase of a unit]
   A 2hl barrel can hold 200 liters of water.