Black porous solid with high absorptive ability. Insoluble in water and organic solvents. Contains 70-75% fixed carbon and 5% ash. Has BET surface area of 500-2,500 square meters per gram
Humidity refers to the amount of water vapor in the air. Absolute humidity measures actual water vapor in grams per cubic meter. Relative humidity compares current moisture to maximum capacity at given temperature
Fragrances have been used to mask odors since antiquity. Consumer products emerged in late 1800s with synthetic fragrances. First fan-operated air freshener launched by Surco in 1948. Commercial aerosol sprays introduced in 1948 based on military technology
Compressed air is air under pressure greater than atmospheric pressure. Contains more water vapor than atmospheric pressure air. Must be cooled to 104°F before entering piping systems
Nm3 stands for "normal cubic meter". It measures gas volume under standard conditions at 0°C and 1 atm. Represents volume of one mole of gas under standard conditions
Coway Airmega AP-1512HH Mighty leads with 99.9% smoke reduction in 30 minutes. Coway Airmega 200M offers similar performance at slightly lower price. Blueair Blue Pure 311i Max provides excellent energy efficiency at 30 watts. Blueair Blue Pure 511 ideal for small spaces with automatic display shutoff