is a trade name for a class of chemicals (known as Chlorofluorocarbons or CFC's) used as a refrigerant in air conditioning systems. Freon is a gas at room temperature and a liquid when cooled or compressed. Freon gas is colorless, non-flammable and relatively odorless. Some Freons have an ether-like odor.
How should I take my forearm circumference measurement? In order to take your forearm circumference measurement, you should tense your arm muscle and measure around the thickest part of your forearm, as pictured.
How to Measure Patio Umbrellas. 1  How to Measure Patio Umbrellas: Patio Umbrella Size is determined in width not height. To find the correct measurements, measure the distance between the top of the rib arm and the bottom the rib arm. 2  IMPORTANT NOTE: There are hundreds of umbrella manufacturers all over the world.