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).
Quick Answer. In both American and European football, no more than 11 players are allowed on the field at any one time from each team. In American football, teams can substitute players at will, while European soccer restricts substitutions to either three per match or a number agreed upon by both teams. Keep Learning.