# Does boiling a cup of water from room temp take the same amount of time as having a pot of boiling water and putting a cup of room temp water in it?

I was thinking and had this discussion with my sister about this. I said that if I had the same stove and same pot and whatever that boiling 1 cup of water in an empty pot would take the same amount of time as boiling water in a pot that already has boiling water. Theoretically of course minimal heat loss and minimal specific heat of the pot.

Since both stoves (identical) are heating up the same amount of water to the same temperature, It should take the same amount of time.

And bonus question if it wasn’t theoretical would the pot with the starting water be faster or slower? I hope my question made sense! Thank you!

• I don't understand how the bonus question is different from the main question! The question is: how does the amount of time it takes to boil a pot of water change if there is already boiling water in the pot, right? Commented Jul 21, 2023 at 20:56