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Thus, a coil may give a ten-inch spark if worked alone, but on a capacity of one-thirtieth of a microfarad it may not be able to give more than a five-millimetre spark.

The farad being inconveniently large for practical use, one-millionth of a farad, called a microfarad, is generally adopted.

The electrical capacity of the whole earth considered as a sphere is about 800 microfarads.

This is accomplished by bridging a considerable capacity across the supply pairs at the private exchange—ten to twelve microfarads usually suffice.

Then we would say that the condenser had a capacity of one microfarad.