Methyl cation, anion, and radical. Methyl cation. The methylium cation (CH3+) exists in the gas phase, but is otherwise not encountered. Some compounds are considered to be sources of the CH3+ cation, and this simplification is used pervasively in organic chemistry.
The square foot (plural square feet; abbreviated ft 2 or sq ft) is an imperial unit and U.S. customary unit (non-SI, non-metric) of area, used mainly in the United States and partially in Canada, United Kingdom, Hong Kong, Bangladesh, India and Pakistan. It is defined as the area of a square with sides of 1 foot.
(sq ft to sq yd) and square yards to square feet. The square foot (symbol or abbreviation: sq ft or Sq Ft, plural form: square feet) is a unit of area used in several different systems, including Imperial units, United States customary units and English units. One square foot = 0.111111111 square yards = 0.09290304 square meters = 144 square inches.