Sailboarding at the Summer Olympics Sailboarding at the Summer Olympics Sailboarding or Windsurfing has been one of the Olympic sailing events at the Summer Olympics since 1984 for men and 1992 for women. All sailors use the same One Design boards, daggerboards, fins and sails. The equipment is chosen to allow racing in a wide range of sailing conditions, as during the Olympic Games events must take place as scheduled whether or not there is enough wind for planing. Multiple medal winners include Alessandra Sensini and Barbara Kendall with three medals; and Bruce Kendall (brother of Barbara Kendall) and Dorian van Rijsselberghe with two medals.
Thermodynamic activity arbitrary; however, it is often chosen out of mathematical or experimental convenience. Alternatively, it is also possible to define an "absolute activity", , which is written as: The activity coefficient , which is also a dimensionless quantity, relates the activity to a measured amount fraction (or in the gas phase), molality , mass fraction , amount concentration or mass concentration : The division by the standard molality or the standard amount concentration is necessary to ensure that both the activity and the activity coefficient are dimensionless, as is conventional. The activity is the same regardless of the ways to express