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Sagot :
Step 1 - Understanding the relation between volume and temperature for a gas
There are three very important variables that can alter the state of a gas: pressure, temperature and volume. When pressure is kept constant, the volume will increase proportionally to the temperature. This is known as Charles Law and can be stated mathetically as:
[tex]\frac{V}{T}=\text{constant}[/tex]Whenever the temperature of a gas samples is raised rather quickly, it will expand a lot in a little space of time. This is known as explosion: the very rapid expansion of a gas. The greater the temperature, the greater the explosion because the volume will increase proportionally to T.
Step 2 - Understanding its relation to fireworks
The firework works via a chemical reaction that will reach very high temperatures. The substances in there will become gaseous and, due to the high temperature, the gases will expand quickly. This causes the explosions of fireworks.
The high temperature also allows electrons to jump from one level to an upper level, thus producing light when they come back. The greater the temperature reached by the reaction in the firework, the more the gas will expand, thus forming a more "spread" firework.
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