When to add salt to cooking water?

Step by step recipe:

  1. 2 min.When to add salt to cooking water? : Photo of step #1
    1 litre of water is put in a pan and 1 tbs coarse salt is added.
  2. 10 min.When to add salt to cooking water? : Photo of step #2
    The water temperature is measured in the same way, every minute, until it boils.
  3. When to add salt to cooking water? : Photo of step #3
    Let's compare times and temperatures in this diagram: the unsalted water in green, the salted water in red.

Conclusion

At the start of heating, the temperature of the salted water rises more slowly: after 3 minutes 30 seconds the unsalted water is already at 040C (100F), while salted water is still at 025C (80F).
But then the two catch up and they take the same time to reach 100C (210F).
Another point: it seems, but I'm not really adamant about it, that salted water starts to boil at a lower temperature than unsalted, i.e. around 90C (190F) rather than 100C (210F).

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