Meters should be used to measure the length of a tennis court in metric units.
There are no units of measure suitable for measuring a sport. A tennis court, net, ball, racquet, player can all be measured, but not tennis itself!
metres
The unit commonly used to estimate the density of objects, including a tennis ball, is grams per cubic centimeter (g/cm^3). Density is calculated by dividing the mass of the object by its volume, and the resulting value is expressed in this unit.
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Tennis
The typical sport that uses the term, "deuce", is Tennis or Table Tennis.
Well, per unit time played, it doesn't! In fact, most other sports would require more oxygen uptake over say a 'regular' ten minute's period of play than tennis.
If you wish to compare their respective weights then it is important to use the same units
lawn tennis is a tennis
Rodney George Laver has written: 'Tennis for the bloody fun of it' -- subject(s): Tennis '228 tennis tips' -- subject(s): Tennis 'The education of a tennis player' -- subject(s): Tennis 'How to play championship tennis' -- subject(s): Tennis 'Tennis digest' -- subject(s): Tennis