Windsurfing aside, many expert windsurfers will ride the same waves as surfers do (wind permitting). At one time referred to as "surfing's ginger haired cousin" by the sport's legendary champion, Robby Naish, windsurfing has long struggled to present a coherent image of the sport to outsiders. As a result of attempts to claim the word "windsurfer" as a trademark, participants have been encouraged to use different names to describe the sport, including "sailboarding" and "boardsailing". The term "windsurfing" has persisted as the accepted name for the sport, and the word "windsurfer" persists for both participants and equipment. Windsurfing is predominately undertaken
Activity coefficient be adjusted for non-ideality by scaling partial pressures by a fugacity coefficient. The concept of activity coefficient is closely linked to that of activity in chemistry. The chemical potential, "μ", of a substance B in an ideal mixture of liquids or an ideal solution is given by where "μ" is the chemical potential of a pure substance formula_2 and "x" is the mole fraction of the substance in the mixture. This is generalised to include non-ideal behavior by writing when "a" is the activity of the substance in the mixture with where "γ" is the activity coefficient, which may itself