"Sub-Ohm" means vaping with an atomizer, such as those in Aspire or KangerTech vaporizer kits, whose coils have a resistance of less than one ohm. Sub-ohm vaping utilizes the principles of Ohm's and Joule's laws of electricity. For those of us non-physicists, this means a non-variable voltage source, such as the battery in a mechanical vape mod, will increase the overall power output (wattage) of your device when you decrease the resistance (ohms) of your coils. To simplify, sub-ohming uses much more power to spread a larger amount of heat over a much larger area, which causes more e-juice to be vaporized in one moment. If you’re concerned about burning the juice, don't worry. Each specific spot is getting the same amount of heat as it would be with regular atomizers, but the area of atomization is much larger. This results in more vapor production, which means you'll be blowing a much bigger cloud. Typically sub-ohm vapers take lung hits meaning they inhale straight to their lungs increasing the vapor they can inhale each puff. Usually those vaping sub-ohm will also use lower nicotine strengths (typically 6mg/ml and under) compared to those vaping above 1 ohm also because of the additional vapor produced and inhaled each pull. The extra heat that is produced also causes the vapor to be warmer.
If you're looking to customize your vaporizer, make sure to educate yourself as much as possible. A great vape build can enhance your smoking experience but a botched build can do the opposite. Use this guide and some of our other information resources to help you in your building.