As you can see these little blocks weigh 1 pound each.( I know ,but trust me)
This is a 2 inch by 2 inch square cheese mold with the 1 inch by 1 inch squares marked on the the follower.
Now we put the 1 pound cubes on the cheese. As you can see there are 2 cubes on each of the square inches that were marked on the follower. That is 2 Pounds on each Square Inch. That is 2 PSI of PRESSURE.
Now we take the 8 blocks off and weigh them. That is 8 pounds of WEIGHT.
So on a 2 inch square mold it takes 8 pounds of WEIGHT to get 2 Pounds per Square Inch (PSI) of PRESSURE.
Since this cheese is happy being pressed with 2 pounds on each square inch, let’s make a larger one.
Here is a 3 inch by 3 inch mold with the follower marked with each square inch .
Now we put the 1 pound cubes on the cheese. As you can see there are 2 cubes on each of the square inches that were marked on the follower. That is 2 Pounds on each SquareInch. That is 2 PSI of PRESSURE.
Now we take the 18 blocks off and weigh them. That is 18 pounds of WEIGHT.
So on a 3 inch square mold it takes 18 pounds of WEIGHT to get 2 Pounds per SquareInch (PSI) of PRESSURE.
Now we have two happy cheeses, they were both pressed with 2 Pounds per Square Inch of PRESSURE even though each required a different WEIGHT to get it done.
Here are some true statements:
The only time the weight and pressure are the same number is when your mold is one square inch. But still weight is in pounds and pressure is in PSI.
If you read that you need 100 pounds of “pressure” to make cheese, it’s not true. If you change the word “pressure” to “weight” it probably is true. To get 100 PSI of pressure on a 7 inch by 7 inch mold would take 4900 pounds. In other words drive your car on the cheese!
If you press a 7 inch by 7 inch mold with 100 pounds of “weight” you get about 2 PSI of “pressure”. Not enough for cheddar( 8 PSI is a good pressure for cheddar) but good for lots of other cheeses.