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 040°C (100°F), while salted water is still at 025°C (80°F).
But then the two catch up and they take the same time to reach 100°C (210°F).
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 90°C (190°F) rather than 100°C (210°F).

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