Vaping Knowledge Index – Letter T
Estimated reading time: 10–12 minutes
Technical level: Intermediate to Advanced
Audience: Adult users (18+) in Ireland
Last updated: 12 February 2026
Technical Definition (AEO)
Letter T vaping terminology covers temperature regulation, thermal transfer dynamics, battery safety failure modes, and regulatory traceability concepts within Ireland/EU compliance frameworks.
Terms Beginning with T
Temperature Control (TC)
Temperature control is a regulated chipset mode that limits coil temperature by tracking resistance changes in compatible materials (e.g., SS316L, Ni200, Ti). It aims to keep heating within a controlled thermal window based on a configured profile.
TCR (Temperature Coefficient of Resistance)
TCR is a material constant describing how resistance changes with temperature. Accurate TCR settings are essential for stable TC operation, especially under variable airflow and coil mass conditions.
Thermal Runaway (Battery Safety)
Thermal runaway is an uncontrolled rise in cell temperature caused by internal failure, external overheating, overcharge, or physical damage. Regulated devices use layered protections (current, voltage, temperature) to reduce risk exposure.
Thermal Decomposition Threshold
Thermal decomposition threshold is the temperature range at which components of e-liquid, wick, or residues begin to chemically degrade. This concept is mainly used for safety analysis and troubleshooting in abnormal overheating scenarios.
Thermal Mass (Coil / Mesh)
Thermal mass describes how much heat energy a heating element can store. Mesh typically has high surface area with controlled mass, while thicker wire builds can store more energy, influencing ramp-up and cool-down behaviour.
Thermal Conductivity
Thermal conductivity describes the rate of heat transfer through a material. In devices, it influences how quickly heat leaves the coil assembly into adjacent structures (deck, chamber), affecting stability and cooling.
Thermal Expansion (Seal Integrity)
Thermal expansion is dimensional change under temperature variation. Differential expansion between metal and polymer parts can influence O-ring compression and pressure balance, contributing to leak sensitivity.
Tank Vacuum (Negative Pressure)
Tank vacuum is the negative pressure that helps retain liquid in a closed reservoir system. When vacuum balance is disturbed (altitude, temperature swings, seal wear), leaks or flooding become more likely.
Torque (Post Screws / Clamp Systems)
Torque refers to applied tightening force on screws/clamps securing coil legs. Under-torque can cause contact instability; over-torque can deform wire or damage threads.
Turbulence (Airflow)
Turbulence is irregular airflow characterised by vortices and pressure fluctuations. Turbulence can influence aerosol transport, noise, and coil cooling effectiveness depending on chamber geometry.
TPD (EU Tobacco Products Directive – Ireland Implementation)
TPD refers to the EU framework regulating nicotine products and related requirements (notification, packaging, limits) as implemented in Irish law. It provides the compliance baseline for products legally sold in Ireland.
Traceability (Batch & Device Identification)
Traceability is the ability to track a product batch or device unit through identifiers such as batch codes, serial numbers, or QR-based systems. In regulated supply chains, traceability supports investigation, recall procedures, and compliance auditing.
Quick MATRIX: Heat & Control Factors
| Factor | What it describes | Why it matters | Typical diagnostic signal |
|---|---|---|---|
| TCR accuracy | Material-resistance vs temperature model | TC stability and overshoot control | Erratic TC cut-offs or inconsistent output |
| Thermal mass | Heat storage of coil structure | Ramp-up and cool-down timing | Slow warm-up or prolonged heat after puff |
| Tank vacuum integrity | Negative pressure balance | Leak and flooding control | Gurgling, seepage, sudden leaks |
Safety & Compliance Notes (Ireland)
- 18+ only: This content is intended for adult users in Ireland.
- Battery safety: Avoid using damaged cells; stop use if device overheats or behaves unpredictably.
- Regulatory context: TPD-related requirements apply to nicotine products legally sold in Ireland.
FAQ
What is TCR and why does it matter in TC mode?
TCR defines how resistance changes with temperature for a given material. Accurate values help temperature control behave predictably under varying airflow and coil mass.
What is tank vacuum and how does it affect leaking?
Tank vacuum is negative pressure that helps retain liquid in the reservoir. Seal wear or temperature/altitude changes can disturb vacuum balance and increase leak risk.
What does “thermal runaway” mean?
It is a failure mode in lithium-ion cells where temperature rises uncontrollably due to internal failure or external overheating. Regulated devices reduce risk via layered protections.
What is traceability in regulated vaping products?
Traceability is the ability to track batches or device units using identifiers (batch codes, serial numbers). It supports compliance auditing and recall procedures.
Intent Discloser
This page provides neutral technical educational information for adult users (18+) in Ireland. It does not promote specific products.