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  1. Turn off the switch when the temperature becomes 10°C.
  2. Turn off the switch when the temperature becomes equal to 10°C.

Out of the two sentences I created, I think the second is better, but redundant. Is the first sentence grammatically correct?

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Both sentences are grammatically correct but not at all idiomatic. Instead, I would say "...when the temperature reaches 10°C."

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  • Can "reach" be used not only when the temperature increases to 10°C but also when the temperature decreases to 10°C ?
    – rama9
    Sep 23 at 19:56
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    @rama9 Yes, it works either way. Also, "when the temperature gets to 10°C" is a less formal version of the same thing (and replaces reaches in a number of other contexts as well). Sep 23 at 19:59
  • "When this baby hits 88..." Sep 23 at 20:03
  • For a decrease, you could also use 'drops to 10°C'. Sep 24 at 7:39

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