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.
Use the red PEX tubing to connect the hot water outlet pipe on top of the water heater to the line that carries hot water to the faucets in your home, and the blue PEX tubing to connect the cold water inlet pipe on top of the water heater to the line that carries water into the water heater.