According to ebrew.com 1 gallon of blackberries is equal to 4 lbs. http://www.ebrew.com/primarynews/misc_winemaking_charts.htm
Quart is a unit for volume and pounds is a unit for mass. It is necessary to know the density of blackberries.
A quart equals 1 and 1/2 pounds
A pound of blackberries would be about a pint. There would be 2 pounds in a quart.
Approximately 6.073 pounds per US gallon.
i gallon worth of pounds
how many pounds in a gallon
A US gallon of gasoline weighs approximately 6.3 pounds.
1 gallon of gasoline equals 5.8 to 6.5 lbs.
A gallon weights about 8.4 pounds, so 11 x 8.4 = 92.4 pounds
About 8.35 pounds for one US gallon of water.
There are about 6.5 pounds of corn in a single gallon. This means that a 55 gallon drum could hold 360 pounds of corn.
8 pounds of water in 1 US gallon