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Full Contact Kickboxing
The Professional Karate Association (PKA), later Professional Karate & Kickboxing Association, and now effective from March 1, 2022 PKA Worldwide was originally a martial arts sanctioning organization, now transformed into a martial arts promotion company. Through the 1970s, the PKA was the largest and most successful professional kickboxing organization in the United States and in the UK and much of Europe, featuring such fighters as Bill "Superfoot" Wallace, Joe Lewis, Benny "the Jet" Urquidez, The Iceman Jean-Yves Thériault, Dennis "the Terminator" Alexio, Rick "the Jet" Roufus, Jerry Trimble and Jeff Smith. The original design of the PKA logo is a silhouette of Bill "Superfoot" Wallace performing a roundhouse kick. The PKA introduced Kickboxing to the world when it originated in the 1970s and was brought to prominence in September 1974, when the Professional Karate Association (PKA) held the first World Championships. American Kickboxing was first known as ''Full Co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
PKA Worldwide Logo
In chemistry, an acid dissociation constant (also known as acidity constant, or acid-ionization constant; denoted ) is a quantitative measure of the strength of an acid in solution. It is the equilibrium constant for a chemical reaction :HA A^- + H^+ known as dissociation in the context of acid–base reactions. The chemical species HA is an acid that dissociates into , called the conjugate base of the acid, and a hydrogen ion, . The system is said to be in equilibrium when the concentrations of its components do not change over time, because both forward and backward reactions are occurring at the same rate. The dissociation constant is defined by :K_\text = \mathrm, or by its logarithmic form :\mathrmK_\ce = - \log_ K_\text = \log_\frac where quantities in square brackets represent the molar concentrations of the species at equilibrium. For example, a hypothetical weak acid having ''K''a = 10−5, the value of log ''K''a is the exponent (−5), giving p''K''a&nbs ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
