If energy is transferred to a block of gaianation.netmmand by heating, the lead particles acquire energy. When lead is in the heavy state, its particles are just vibrating, however they vibrate quicker after being heated. Particles room close together in the solid state, for this reason they are most likely to hit every other and transfer energy. Energy is transferred with the block quickly, for this reason the temperature that the block goes up quickly.

The readjust in temperature the a system depends on:

the mass of the problem the nature that the problem itself

The certain heat volume of a problem is a measure of the lot of thermal power needed to boost the temperature the a provided substance.

You are watching: How to calculate thermal energy | physics


The details heat volume of a problem is the amount of thermal power needed to rise the temperature of 1 kg the the problem by 1°C.
Different substances have actually different certain heat capacities. Because that example, the particular heat volume of water is 4,180 J/kg°C, but the details heat capacity of lead is only 129 J/kg°C.

Calculating thermal energy changes

The change in heat energy due to temperature alters is calculated using this equation:

change in thermal energy = fixed × specific heat volume × adjust in temperature

This is when:

change in thermal energy is measure in joules (J)mass is measure in kilograms (kg)specific heat capacity is measure in joules every kilogram per levels Celsius (J/kg°C)change in temperature is measured in levels Celsius (°C)
The indigenous 'specific' in 'specific warmth capacity' method per unit mass, usually per kilogram.

Example

The specific heat capacity for gaianation.netpper is 385 J/kg°C. Calculate the heat energy readjust when the temperature that 2.00 kg the gaianation.netpper is changed by 10.0°C.

change in thermal power = fixed × details heat volume × adjust in temperature

= 2.00 × 385 × 10.0

= 7,700 J (7.7 kJ)

Question

The certain heat volume of water is 4,180 J/kg°C. Calculation the thermal energy change when 0.200 kg the water gaianation.netols from 100°C gaianation.netme 25.0°C.

Reveal answer
change in temperature = (100 - 25) = 75.0°C

change in thermal power = mass × certain heat capacity × readjust in temperature

= 0.200 × 4,180 × 75.0

= 62,700 J (62.7kJ)

Question

The specific heat volume of brick is 840 J/kg°C. Calculation the temperature change when 400 kJ that thermal energy is transferred to a 3.50 kg brick.

See more: What Are The Two Main Parts Of The Bible, Old And New Testaments

Reveal answer
400 kJ = 400 × 1,000 = 400,000 J

change in thermal energy = mass × details heat volume × adjust in temperature

Rearrange the equation:

<= 136°C>


Struggling to get your head ring revision or exams?

Our tips from experts and exam survivors will assist you through.

Get advice here
*

Personalise her Bitesize!

Sign in, choose your GCSE subjects and also see gaianation.netntents that's tailored for you.