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The Hot Water Bottle Mystery
📖 The Hot Water Bottle Mystery
Ever wondered why a hot water bottle keeps you warm for HOURS? Water has an incredibly high specific heat capacity — it takes HUGE amounts of energy to heat up, but then releases that energy very slowly as it cools. A metal spoon in the same pan gets burning hot in seconds, but the water barely warms. This property makes water perfect for heating systems and explains why coastal cities have milder weather — the ocean acts as an enormous heat battery, absorbing energy in summer and releasing it in winter. The UK would have Canadian-style winters without the Atlantic moderating our climate!
Specific Heat Capacity Equation (ON FORMULA SHEET ✓)
ΔE = mcΔθ
Energy change (J) = mass (kg) × SHC (J/kg°C) × temperature change (°C)
What IS Specific Heat Capacity?
Definition: The specific heat capacity (c) of a material is the amount of energy needed to raise the temperature of 1 kilogram of the substance by 1 degree Celsius.
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🧠 Memory Aid: The SHC Equation
Remember ΔE = mcΔθ as: "Energy Makes Change" — Energy = mass × c × change in temperature.
To remember water's SHC of 4200: "Four Two Zero Zero — Water is a slow burner, needs 4200 joules per kilogram per degree."
For the practical: the result is ALWAYS too HIGH because energy LEAKS to surroundings — think of a "leaky thermometer" losing heat.
Now try it yourself
Quiz · Question 1 of 15
What does the specific heat capacity of a substance measure?
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This topic in real past papers
Every real exam question we've found on specific heat capacity, with a full worked answer.