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About 55% of blood is blood plasma, a fluid that is the blood's liquid medium, which by itself is straw-yellow in color. The blood plasma volume totals of 2.7â3.0 liters (2.8â3.2 quarts) in an average human.
A pint of human blood is measured in units. A unit of blood donated is between 450 and 500 mililiters. Since a liter of water weighs 2.2 pounds, a pint or unit of blood weighs a bit more than one pound. So, lose weight, give blood, save a life! Go to www.GiveLife.org to register to donate blood and find a local blood bank or mobile blood drive.