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I didnt understand this either but according to google, "A bomb calorimeter is a type of constant-volume calorimeter used in measuring the heat of combustion of a particular reaction. Bomb calorimeters have to withstand the large pressure within the calorimeter as the reaction is being measured." this isn't super helpful, but it gave me a better idea, hope it helps!
I believe that a bomb calorimeter is an isolated system because it is enclosed and the materials used in it do not allow for the reaction inside to affect the surroundings. This fits the definition of an isolated system as matter can not be exchanged due to the reaction being fully enclosed and the energy can not react with its surroundings due to the materials of the bomb calorimeter itself not allowing it to do so.
MariaJohn1D wrote:Does the pressure change in a bomb calorimeter?
The pressure within the calorimeter can change when there is a reaction. However, the pressure inside is not changed by the external pressure because it is an isolated system.
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