For Those Who Use Bottled Water

[devildancer]

I was calibrating my sight gauge tonight and realized that most gallon jugs of bottled water are actually sold with more than a gallon in them. I know I used to just pour them into the carboy to top of partial boils assuming they were a gallon.

 

[Spartan1979]

When I calibrated mine, I weighed out one gallon, marked the jug and used that mark for subsequent gallons.

 

[TomOliver]

Any idea how much more? Like 130oz. instead of 128oz?

 

[devildancer]

I think they may vary, but have a minimum of 128 oz. I have one here that weighs 138 oz.

 

[Brewham]

2 1/2 gallon Polar jugs hold close to 3 gallons.

 

[Conan]

No kiddin. Glad to know this. I always hoped it was close enough to either 1 or 2.5 gallons, depending. Thanks for the info! Kyle

 

[Link81688]

It sounds like you are saying a gallon weighs 128 oz instead of contains 128 fl oz. On a larger scale (like gallons) you can't interchange weight and volume measurements with water. 8 fl oz of water weighs about 8.35 oz. Multiple that by the 16 cup to a gallon and you end up with a weight of about 134 oz, for one gallon (128 fl oz) of water.
Even I'd you do have a little too much water in your boil by assuming each bottle is exactly one gallon its effect is unnoticable.

 

[devildancer]

I'm saying that I measured 128 fl oz into a gallon jug and it did not come to the same level as an unopened gallon jug of water. I weighed my 128 fl oz jug and it was right around 132 oz. I can live with that margin of error. One brand new one weighed 138 oz. The difference may be negligible, but when you scale it up it can make a difference. Thanks for your feedback.

 

[motobrewer]

at 70F, water weighs 8.328676 pounds per gallon.

at 59F, it's 8.337915 lb/g

therefore, at 70F, one gallon of water will weigh 133.258816 ounces

 

[TipsyDragon]

at 70F, water weighs 8.328676 pounds per gallon.

at 59F, it's 8.337915 lb/g

therefore, at 70F, one gallon of water will weigh 133.258816 ounces

interesting .... site your source. i totally believe you i just want to read it myself too.

 

[motobrewer]

it's not very interesting, it's just the density of water.

fluid ounce is not the same avoirdupois ounce (mass measurement).

well if you want a source i just googled "density of water" and got this:

http://www.engineeringtoolbox.com/water-density-specific-weight-d_595.html

also, "weight" will change (very slightly) depending upon your altitude, as the farther you get away from the center of the earth the lower the force (acceleration) of gravity