Question

I need to determine the freezing point of the methanol-water mix in the ground loop of my heat pumps. I have a hydrometer and have measured the specific gravity as 0.905. How do I convert this to a freezing point?

The specific gravity was taken at about 16°C (60°F).
I found this chart for mass and volume, but not specific gravity.

Answer 1

To convert specific gravity to a freezing point, you can use the formula: Freezing Point = 0.9 x specific gravity - 0.5

Step-by-step explanation:

The freezing point of a solvent can be determined using the specific gravity of a solution. The specific gravity is a measure of the density of a solution compared to the density of water. To convert specific gravity to a freezing point, you can use a table or formula that relates specific gravity to freezing point. Since there is no specific table provided for specific gravity, you can use the formula:

Freezing Point = 0.9 x specific gravity - 0.5

For example, if the specific gravity of your solution is 0.905, the freezing point would be:

Freezing Point = 0.9 x 0.905 - 0.5 = -0.0445°C