Learn these two constants now. Repeat them in your mind several times a day. Learn to recite them with the same ease in which you recite your telephone number.
1. There are 8.34 pounds of water in one gallon of water.
2. There are 7.48 gallons of water in one cubic foot of water.
If you have trouble remembering numbers, think of them as time. Think of 8.34 as 8:34 pm or 7.48 as 7:48 am.