Best Answer: 1) As the person above said: carbon, hydrogen, and oxygen. 2) No. This is unless we consider formic acid as a fatty acid (CH2O2), but the definition of a fatty acid is a carboxylic acid with a LONG unbranched aliphatic tail that is either saturated or unsaturated.
When the tubing is cool, the warm and moist air may condense in the tubing. Not only will you not get the benefit of the moisture, but it can collect and drip into your face or gurgle with the air flow. It is often worse when the bedroom environment is cool or cold compared to the temperature of the pressurized air.
When a small air bubble get in the tubing, you manipulate the tubing so that the air nears a close port. You can then flick the port and the air escapes. Non-vented tubing must be backflowed or advanced/re-primed to rid tubing of air. Primary tubing is used when infusing 1 or more fluids.