Obtain the proper kind of hydrogen peroxide. You can use hydrogen peroxide to clear acne using one of two methods: in a cream, which contains a concentration of up to 1% hydrogen peroxide; and in âpureâ liquid form, which should contain no more than a 3% concentration.
3. Pitch : Pitch is the theoretical distance a propeller will move through the water for each revolution. (i.e. a 21pitch propeller should move a boat forward 21 for each revolution, assuming there is no slippage).
propping. 1  transitive verb. 2  1a : to support by placing something under or against âoften used with upb : to support by placing against something. 3  2 : sustain, strengthen âoften used with up a government propped up by the military.