Trivia for the day: Density is not Specific Gravity

[Silver_Is_Money]

The Specific Gravity of DI Water at 20 degrees C. is 1.000000

The Density of DI Water at 20 degrees C. is 0.998207

 

[day_trippr]

 

[passedpawn]

Helps a lot when units are presented (where applicable).

 

[Pkrd]

Citation needed.

I've been using 0.99823g/ml all this time!
No wonder my homebrew sucks.

 

[Silver_Is_Money]

Citation needed.

I've been using 0.99823g/ml all this time!
No wonder my homebrew sucks.

See the chart that's a bit more than a third of the way down the page at this web link. Units are also explained on this page:

https://www.engineeringtoolbox.com/water-temperature-specific-gravity-d_1179.html
Your homebrew will be magically transformed!

 

[Silver_Is_Money]

Oh my! Good thing I prefaced it as trivia.

 

[ScrewyBrewer]

Honestly, there is nothing trivial about 0.001793g/ml

 

[HB2 HughBHomeBrew]

The Density of DI Water at 20 degrees C is 6.8398906e-11 slugs/femtoliter. Units matter. You're welcome.

 

[Pkrd]

Y’all are remembering to adjust that number for any water additions you might make, right?

 

[Silver_Is_Money]

Compared to the ppm vs. mg/L controversy the density vs. SG controversy is indeed trivial. Now if I add 50 ppm of calcium to 30 Kg. of distilled water, and then I subsequently toss in 3 Kg. of DME (or accomplish the same via mashing, if all grain), I now have only 30/33 x 50 = 45.45 ppm of calcium. But (presuming essentially no volume change) I still have my starting 50 mg/L of calcium, since I still have only 30 Liters with 50 mg of calcium in each Liter. A difference between mg/L and ppm of 50/45.45 x 100 = 10%, and an error of 10% should not be considered to be trivial. Should I add more calcium?

 

[Pkrd]

What's a Kelvin gram?