Your question is too vague, the capacity of what? Capacity of containers can be measured with volume, and units would be liters, quarts, or gallons. Capacity of computer systems is often measured in...
Any unit of volume is a unit of capacity (and vice versa). A few of the popular ones include . . . -- fluid ounce -- milliliter -- cup -- pint -- quart -- liter -- cubic centimeter -- cubic meter --...
Boiler loads, or the capacity of steam boilers, are often rated in boiler horsepower, lbs of steam delivered per hour, or BTU. Large boiler capacities are often given in lbs of steam evaporated per...