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Is there a difference in tepid water and lukewarm water? Are the terms interchangeable?

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up vote 7 down vote accepted

The terms are interchangeable.

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Synonymous, equivalent, same thing, equal - and when in doubt, body temperature works. – Jolenealaska Aug 13 '14 at 11:54

There is no difference, thus the terms are interchangeable.

Tepid water consists of two parts cold water and one part boiling water, which renders a temperature of about 40 degrees Celsius, which is round about 105 degrees Fahrenheit.

Luke warm water is also considered in the same temperature range, which concludes that both are the same.

A quick test would be that the water to the touch should just be a bit warmer that normal body temperature and should not burn you

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40C = 104F, Google comes in handy. – Jolenealaska Aug 13 '14 at 12:11
Thanks for that :-) – Pieter Goosen Aug 13 '14 at 12:16

In my experience "tepid" means "room temperature" whereas "lukewarm" means "just barely warm". So I'd rate tepid as just slightly cooler. But that's splitting hairs. In practical terms -- ie in recipes -- they're interchangeable.

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