Definition

Noun: A nuclear reaction that occurs with the absorption of energy. In such a reaction, the total kinetic energy of the resulting particles is less than the total kinetic energy of the initial particles because energy is taken in from the surroundings.

Usage

The term is used specifically in the fields of nuclear physics and chemistry to describe a type of reaction that requires an input of energy to proceed. It is the opposite of an exoergic reaction.

Examples

• Noun:
  • The fusion of hydrogen nuclei in the sun's core is an endoergic reaction, requiring immense heat and pressure to initiate.
  • Scientists studied the endoergic reaction to understand the energy thresholds needed for the process.

Advanced Usage

• In Context: Often discussed in contrast to "exoergic" or "exothermic" reactions. The concept is crucial for understanding nuclear stability, particle accelerators, and stellar nucleosynthesis.
  • For the experiment to succeed, they had to first overcome the energy barrier of the endoergic reaction.

Variants and Related Words

• Endothermic (adj): A more general chemical term for a process that absorbs heat. While "endoergic" is specific to nuclear reactions involving total kinetic energy, "endothermic" is used for chemical reactions.
  • The melting of ice is an endothermic process.
• Endergonic (adj): A term used in biochemistry and thermodynamics for a reaction that requires an input of free energy.
  • Photosynthesis is an endergonic reaction driven by sunlight.

Synonyms

• Energy-absorbing reaction: A descriptive synonym emphasizing the key characteristic.
• Non-spontaneous reaction (under standard conditions): Highlights that the reaction does not occur without an external energy source.

Antonyms

• Exoergic reaction (n): A nuclear reaction occurring with the release of energy.
• Exothermic reaction (n): A chemical reaction that releases heat.

Noun

1. a nuclear reaction occurring with absorption of energy