Temperature, Heat & Change of State | Unit 303 Phase 2

Why can a pressurised hot-water system become so dangerous when pressure is suddenly released? In this episode of The Copper Connection Podcast, Chris Bailey explains the scientific principles behind temperature, heat and change of state for plumbing and heating apprentices.

Covering Unit 303, Phase 2, Session 2, this episode supports the 9289 Plumbing and Domestic Heating Technician apprenticeship and helps learners prepare for the Scientific Principles assessment criteria:

• AC 3.1: The relationship between Celsius and Kelvin temperature scales

• AC 3.2: The principles associated with changes of state

• AC 3.3: Sensible heat and latent heat in liquids and gases

You will learn:

• How to convert between Celsius and Kelvin

• What ΔT means in heating and heat-loss calculations

• How solids, liquids and gases change state through melting, evaporation, condensation and freezing

• Why water expands when heated, freezes, and turns to steam

• Why frozen water can split pipework

• How pressure changes the boiling point of water

• Why unvented cylinders, sealed systems, pressure-relief valves and safety cut-outs must be treated with respect

• The crucial difference between sensible heat and latent heat

• Why superheated water can flash rapidly into steam when pressure is released

This is not abstract science for the sake of an exam. It is the knowledge behind the safety procedures, system design and commissioning decisions you will encounter throughout your plumbing and heating career.

Follow The Copper Connection Podcast for practical, exam-focused support for plumbing, heating and building-services learners.

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