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2. Hair iron - Wikipedia

   en.wikipedia.org/wiki/Hair_iron

   historical image of hair irons (top) A hair iron or hair tong is a tool used to change the arrangement of the hair using heat. There are three general kinds: curling irons, used to make the hair curl; straightening irons, commonly called straighteners or flat irons, used to straighten the hair; and crimping irons, used to create crimps of the desired size in the hair.

3. Perm (hairstyle) - Wikipedia

   en.wikipedia.org/wiki/Perm_(hairstyle)

   Sodium hydroxide (caustic soda) was applied and the hair was heated to 212 °F (100 °C) or more for an extended period of time. The process used about twelve 2-pound (0.9 kg) brass rollers and took six hours to complete. These hot rollers were kept from touching the scalp by a complex system of countering weights which were suspended from an ...

4. Glossary of curling - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_curling

   A curling team. Often used with a location ("the Manitoba rink") or the name of the skip ("the Smith rink"). A building housing the ice sheets ("the curling rink") Sometimes used as a synonym for sheet; Roaring Game, The Slang for the game of curling, it is the sound a stone makes while sliding along the ice Rock The device thrown by curlers ...

5. Ionic strength - Wikipedia

   en.wikipedia.org/wiki/Ionic_strength

   The molar ionic strength, I, of a solution is a function of the concentration of all ions present in that solution. [3]= = where one half is because we are including both cations and anions, c i is the molar concentration of ion i (M, mol/L), z i is the charge number of that ion, and the sum is taken over all ions in the solution.

6. Barrel (unit) - Wikipedia

   en.wikipedia.org/wiki/Barrel_(unit)

   According to the American Petroleum Institute (API), a standard barrel of oil is the amount of oil that would occupy a volume of exactly 1 barrel (158.99 L) at reference temperature and pressure conditions of 60 °F (15.6 °C) and 14.696 psi (1,013.25 hPa) (or 1 atm). This standard barrel of oil will occupy a different volume at different ...

7. Metal ions in aqueous solution - Wikipedia

   en.wikipedia.org/wiki/Metal_ions_in_aqueous_solution

   The strength of the M-O bond tends to increase with the charge and decrease as the size of the metal ion increases. In fact there is a very good linear correlation between hydration enthalpy and the ratio of charge squared to ionic radius, z 2 /r. [4] For ions in solution Shannon's "effective ionic radius" is the measure most often used. [5]