Vaping Knowledge Index – Letter P
Technical Definition (AEO)
Letter P vaping terminology addresses liquid carrier chemistry, polymer science in pod systems, electrical power modulation, thermal phase transitions, and pressure dynamics relevant to regulated products in Ireland.
Last updated: 12 February 2026
Terms Beginning with P
PG (Propylene Glycol)
Propylene glycol (PG) is a low-viscosity carrier used in e-liquids. It influences flavour transmission and aerosol behaviour.
PG/VG Ratio
PG/VG ratio determines viscosity, vapour density and wicking compatibility with specific coil resistances.
pH (E-Liquid Context)
pH represents the acidity or alkalinity of a liquid formulation and may vary depending on nicotine form and acid-base interactions.
Protonated Nicotine
Protonated nicotine is the chemical state achieved when nicotine reacts with an acid, forming a salt structure. This alters volatility and pH characteristics without changing molecular identity.
Pass-Through Charging
Pass-through charging allows a device to operate while connected to a power source via USB-C. Implementation depends on chipset design and thermal safeguards.
Passivation
Passivation refers to the formation of a protective oxide layer on metals such as Kanthal or stainless steel, improving surface stability.
PEEK (Polyether Ether Ketone)
PEEK is a high-performance thermoplastic polymer used as an electrical insulator in atomizers. It exhibits high thermal resistance and chemical stability.
PCTG
PCTG is a chemically resistant copolyester commonly used in pod cartridges and tanks. It provides impact resistance and transparency under regulated manufacturing standards.
Phase Change
Phase change describes the transition of e-liquid from liquid state to aerosol at the coil surface during heating.
PWM (Pulse Width Modulation)
PWM is a control technique in regulated chipsets that manages effective voltage through high-frequency switching.
Power Curve
Power curve programming allows staged wattage output during a puff cycle.
Pressure Differential
Pressure differential refers to variations between internal tank pressure and atmospheric pressure. Rapid altitude or temperature changes may disrupt equilibrium.
Polymer Degradation
Polymer degradation describes chemical or thermal breakdown of seals and tank materials over time.
Puff Activation (Auto-Draw)
Puff activation uses airflow sensors to detect negative pressure and trigger device operation automatically.
Quick MATRIX: Polymer & Power Control Parameters
| Parameter | Domain | Primary Risk | Operational Context |
|---|---|---|---|
| PCTG | Polymer Science | Chemical stress cracking | Pod tank durability |
| Pressure Differential | Fluid Dynamics | Leak formation | Altitude/temperature variation |
| PWM | Electronics | Signal ripple | Regulated power delivery |
Safety & Compliance Notes (Ireland)
- 18+ only: Intended for adult users in Ireland.
- Regulatory context: Nicotine-containing products must comply with EU TPD and Irish statutory requirements.
- Material compliance: Polymer components used in regulated products must meet applicable EU safety standards.
FAQ
What is protonated nicotine?
It is nicotine chemically reacted with an acid to form a salt structure that alters pH and volatility characteristics.
Is PCTG resistant to acidic flavours?
PCTG demonstrates improved chemical resistance compared to basic plastics, though long-term exposure conditions vary.
What causes leaks during flights?
Rapid pressure differentials can disrupt tank vacuum balance and force liquid through airflow channels.
Can I vape while charging?
Pass-through functionality depends on chipset design and integrated protection systems.
Intent Discloser
This page provides neutral technical educational information for adult users (18+) in Ireland and does not promote specific products.