1 7-Zip-Right-click on the file or folder you want to compress and select 7-Zip â Add to archive. 2  In the Add to Archive menu, you can set your compression options. 3  Note that increasing compression levels can significantly increase the time it takes to compress. 7-Zip-Right-click on the file or folder you want to compress and select 7-Zip â Add to archive. 2  In the Add to Archive menu, you can set your compression options. 3  Note that increasing compression levels can significantly increase the time it takes to compress.
Endothermic reactions are the opposite. The new bonds require more energy. This comes from heating the substances, or sometimes, comes from the surrounding environment. Absorbing heat energy from the environment makes everything decrease in temperature so the reaction 'feels' cooler.
Endothermic reactions absorb energy from the surroundings, while exothermic reactions release energy to the surroundings. Fuels release energy when they burn. The energy output of a fuel can be measured by calorimetry using a known mass of water.