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.
Its plural is square feet, and abbreviated as ftÂ² or sq ft. The square foot is primarily used in the U.S., UK, HK, Canada, Pakistan, India and Afghanistan. 1 square foot is equal to 0.09290304 square meters. Square Meter. The square meter (also spelling square metre, symbol mÂ²) is the SI derived unit of area.