How much does 20 liters weight? (20 liters of fuel, or juice)
And for the transport industry... liters per hours ie if a truck run 12 mpg, then it should burn so many gallons per hours, 1 gallon weights x then in 4 hrs the vehicule will have burned xy lbs... used to have a formula for this, that i've miss placed, was very usefull during thaw season in canada. ...