Translation guide
A fluid used to remove heat from a system, such as an engine, reactor, or cutting tool.
The liquid that circulates in a car engine or similar system to prevent overheating.
Literally 'cooling water'. The most common term for engine coolant, especially in cars.
Please check the coolant level.
The engine coolant is leaking.
Loanword from English. Used in technical contexts, often for industrial coolants or in product names.
Antifreeze. Specifically refers to the coolant's antifreeze properties, often used in winter contexts.
Fluid used to lubricate and cool cutting tools during metalworking or machining.
Fluid circulated through a nuclear reactor to transfer heat.
General term for reactor coolant, often used for substances like liquid sodium or water.
Liquid sodium is used as a coolant in nuclear reactors.
冷却水 is the everyday term for engine coolant. クーラント is a loanword used in technical or industrial contexts, and may sound more specialized.
Coolant for air conditioners or refrigerators is called 冷媒 (れいばい), not 冷却水 or クーラント.
Check the coolant level.
The coolant needs to be replaced.
このクーラントは希釈して使います。
This coolant is used after dilution.
I changed the antifreeze before winter.
水溶性クーラントを使用しています。
We use water-soluble coolant.