h

/eitʃ/
Học thuật
Thân thiện
h

A child points to the letter H in an alphabet book.

Definition
  1. Noun:
    • The eighth letter of the English alphabet: "H" is a consonant, the eighth letter in the modern English alphabet.
    • Symbol for the element Hydrogen: In chemistry, "H" is the chemical symbol for hydrogen, the lightest and most abundant chemical element.
    • Symbol for enthalpy: In thermodynamics, "H" represents enthalpy, a measure of total energy in a thermodynamic system.
    • Symbol for the Planck constant: In physics, "h" denotes the Planck constant, a fundamental constant relating the energy of a photon to its frequency.
    • Symbol for the henry: In physics and electrical engineering, "H" is the symbol for the henry, the SI unit of electrical inductance.
Usage Examples
  • Noun (Letter):
  • Noun (Chemistry):
  • Noun (Physics/Thermodynamics):
Advanced Usage
  • "H-bomb": A common abbreviation for a hydrogen bomb, a type of nuclear weapon. (Note: This is a compound word listed separately as a variant).
  • In specific notations: Often used in scientific formulas and abbreviations, such as pH (where H stands for hydrogen ion concentration) or Hz (hertz, where the H honors physicist Heinrich Hertz).
Variants and Related Words
  • H-bomb (n): Hydrogen bomb.
  • H-hour (n): In military usage, the specific time an operation begins.
  • H-shaped (adj): Having a shape resembling the letter H.
Synonyms
  • Aitch: The name of the letter 'H' itself.
  • Hydrogen: When referring to the chemical element.
  • Enthalpy: When referring to the thermodynamic property.
Related Phrases (Phrasal Verbs)

(Not commonly applicable for the single letter "h")

Related Idioms
  • "To drop one's aitches": To omit the 'h' sound at the beginning of words, often considered a feature of some dialects or informal speech.
h

A child points to the letter H in an alphabet book.

Noun
  1. (thermodynamics) a thermodynamic quantity equal to the internal energy of a system plus the product of its volume and pressure
    • enthalpy is the amount of energy in a system capable of doing mechanical work
  2. the 8th letter of the Roman alphabet
  3. the constant of proportionality relating the energy of a photon to its frequency; approximately 6.626 x 10^-34 joule-second
  4. a unit of inductance in which an induced electromotive force of one volt is produced when the current is varied at the rate of one ampere per second
  5. a nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas; the simplest and lightest and most abundant element in the universe

Từ đồng nghĩa

Từ chứa "h"

Từ có nhắc đến "h"