Does water weigh the same hot or cold?

[singybrue]

Sorry, I'm not so strong on sciencey/math stuff.
OK, so water weighs 8.33 or 8.34 pounds per gallon.
I know it changes volume when heated, what about weight?
Will it weigh the same when it's boiling as it would at 60^?
I just had the idea about putting a weight sensor under a pot and using that to figure out your water volumes in a BIAB setup- pre-mash, pre-boil and post boil volumes.

 

[mliptack]

Simply put. Yes. Ignoring losses to steam etc.

Once you have added grain and have wort, you need to calculate the weight of the added sugars. Beersmith has a calculator for this.

Cheers,
Max

 

[bruteforce]

the water will weigh the same, but take up more space as it reaches 200+ degrees. So its a question of density. It will weigh less per cubic foot at high temps, but still the same overall. Even then , I think its about a 3% difference from room temp to almost boiling.

As long as your sensor can stand the heat, it might work, though some trial and error would be needed

 

[singybrue]

I'm using an induction burner for 2.5-3g batches.
I was thinking I could put the sensor under the whole kit and kaboodle, then zero it out and away I go!