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Glossary of E-Cigarette Terms



This refers to the screw thread connection and is the most commonly used thread pattern on an e-cigarette battery or vaping accessory connection.  It also refers to the compatibility of components.

Adjustable Airflow:

This allows vapers to adjust the airflow into the tank via either a screw or dial to customise the amount of vapour and flavour.

Atomizer Head:

A unit that houses the heating coils and wicking material. Atomizer heads are consumable products that require replacement usually between 4-6 weeks depending on the device and individual use.

BDC - Bottom Dual Coil:

A BDC is an atomizer head that has two coils mounted in the base of a tank. The base position means that the heating coils are permanently immersed in e-liquid to prevent overheating the coils. The dual coil refers to two coils in parallel which diffuse the load evenly to deliver high performance and durability.


Burning occurs if the coil gets too hot and there is insufficient e-liquid in the device. In certain circumstances the wicking material burns which can result in an acrid taste that is unpalatable. Once a coil is burnt it is unlikely to recover normal performance and usually needs replacing.


Used in the original Odyssey tank, a cartomizer contains absorbent wadding, which is soaked with e-liquid.

Dry Hit:

A dry hit occurs if the wicking material is too dry due to lack of e-liquid in the e-cigarette.

E-cig / E-cigarette:

These are terms that are commonly used to refer to electronic cigarettes.


E-liquid is the fluid which is used to produce vapour and flavour on inhalation of an e-cigarette. They can be flavoured or unflavoured and are available in different nicotine strengths.  E-liquids are also offered as pre-mixed fluids which can be used straight from the bottle or vapers can mix their own for a more personalised vape.

Ohm (Ω):

The ohm is the SI unit (International System of Units) of electrical resistance.  Ohms Law is named after its creator, the German physicist Georg Simon Ohm.  Atomizer heads have a varying range of resistance of the heating coil which is measured as a numerical value. E.g. 1.8ohm.


Organic Light-Emitting Diode - displays vaping information on a digital screen.


A plinth is decorative collar of metal that is used on the outer thread of an e-cigarette battery to enhance the appearance of the e-cigarette and add stability to a flat-based tank.

RCS (Replacement Coil System):

RCS refers to an atomizer head which can be replaced when the coil reaches the end of its natural life.


See Ohms Law above.


The tank usually sits on top of the e-cigarette and connects to the battery, though some devices now have integrated tanks. This part of the e-cig houses the atomizer and e-liquid.

Temperature Control (TC):

TC devices heat the coils more quickly and maintain the temperature instead of ‘spiking’ and provide a more consistent performance. TC also prevents dry hits and coil damage. 


The inhalation and exhalation of vapour produced by an e-cigarette is referred to as vaping.

VV - Variable Voltage / VW - Variable Wattage:

There are two common output measurements that devices refer to, Variable Voltage (VV) and Variable Wattage (VW). Put simply a Variable Wattage device detects the atomizer resistance and selects the correct voltage to deliver the desired output whereas a Variable Voltage device delivers the selected output irrespective of the atomizer resistance.


Wicks are made from a variety of materials but the most commonly used is Silica rope. The wick is housed in the atomizer and absorbs the e-liquid when the coil is heated to produce vapour.