Laboratory centrifuge. A laboratory centrifuge is a piece of laboratory equipment, driven by a motor, which spins liquid samples at high speed. There are various types of centrifuges, depending on the size and the sample capacity.
In American football, each team is allowed 11 men on the field during a play, for a total of 22 players plus the officials.  If there are more than 11 players on the field foâ¦r a play, the team with too many players may be assessed a 5-yard penalty and any play that occurred may be nullified (at the discretion of the opposing team).
List of positions. In American football, each team has 11 players on the field at one time. However, because the rules allow unlimited substitution between plays, the types of players on the field for each team differ depending on the situation. In the NFL, most play only offense or only defense, with two-way players being of the long-ago past.