Energy changes
Read our general notes on Risk Assessment
What is the difference between heat and temperature?
Heating is a transfer of energy from something at a higher temperature (such as a flame) to something at a lower temperature (such as water in a beaker).
In chemistry the energy transferred to, or from, a system at constant pressure is the enthalpy change.
Two objects are at the same temperature if no energy transfers from one to the other when they are in thermal contact.
Materials differ in the quantity of energy needed to bring about a given temperature change. It takes much more energy to bring about a 10 degree rise in the temperature of 1 kg of water than it does to bring about the same temperature change in 1 kg copper.
Orion
Risk assessment
Before attempting any practical work based on the advice and suggestions on this website, you must do the following. Identify any hazards, assess the risks from these hazards, and then decide appropriate control measures to reduce the risks. You must have these approved by those in authority in your school or college laboratory. Do not rely on what is said on this website.
For further guidance see our tutorial on Risk Assessment.
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updated: 02 October 2003
