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.
There are 12 inches in one foot. In one square foot, there are 144 square inches. The conversion value for square inches to square feet is 144. To convert an area measured in square inches into square feet, divide the number of square inches by 144. For example: 200 square inches / 144 = 1.39. The last step in converting square inches to square feet is to label the answer with the correct unit. Continuing with the example, 200 square inches equals 1.39 square feet.