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Published byPhilippa Freeman Modified over 9 years ago
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Gas Laws Studies of the behavior of gases played a major role in the development of physical sciences in the 7 th and 8 th centuries.
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Boyle’s Law Robert Boyle was among the first to note a relationship between pressure and volume of a gas. He measured the volume of air at different pressures, and observed a pattern of behavior. During his experiments temperature and amount of gas never changed Robert Boyle was among the first to note a relationship between pressure and volume of a gas. He measured the volume of air at different pressures, and observed a pattern of behavior. During his experiments temperature and amount of gas never changed
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Boyle’s Law Boyle found that as pressure increases, volume decreases. For example: Boyle found that as pressure increases, volume decreases. For example:
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Boyle’s Law Because we know: as pressure increases, volume decreases, we also know that as pressure decreases, volume increases. This is known as an inverse relationship (as one variable increases, the other decreases) Because we know: as pressure increases, volume decreases, we also know that as pressure decreases, volume increases. This is known as an inverse relationship (as one variable increases, the other decreases)
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As the pressure increases Volume decreases Volume decreases
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How does Pressure and Volume of gases relate graphically? Temperature, # of particles remain constant Temperature, # of particles remain constant Volume Pressure As pressure increases, volume decreases.
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Charles’s Law Jacques Charles determined the relationship between temperature and volume of a gas. He measured the volume of air at different temperatures, and observed a pattern of behavior. During his experiments pressure of the system and amount of gas were held constant. Jacques Charles determined the relationship between temperature and volume of a gas. He measured the volume of air at different temperatures, and observed a pattern of behavior. During his experiments pressure of the system and amount of gas were held constant.
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Charles’s Law Charles found that as temperature increases, volume increases. For example: A helium balloon during summer: A helium balloon is blown up inside a store. After spending a few hours outside in the sun the balloon begins to expand (volume increases). Charles found that as temperature increases, volume increases. For example: A helium balloon during summer: A helium balloon is blown up inside a store. After spending a few hours outside in the sun the balloon begins to expand (volume increases).
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Volume of balloon at 25° C Volume of balloon at -5°C
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Charles’s Law Because we know: as temperature increases, volume increases, we also know that as temperature decreases, volume decreases. This is known as a direct relationship (the variables increase and decrease together). Because we know: as temperature increases, volume increases, we also know that as temperature decreases, volume decreases. This is known as a direct relationship (the variables increase and decrease together).
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How does Temperature and Volume of gases relate graphically? Pressure and the # of particles remain constant Pressure and the # of particles remain constant Temp Volume As temperature increases, volume increases. As temperature decreases, volume decreases. REMEMBER: Volume is the amount of space matter takes up. REMEMBER: Volume is the amount of space matter takes up.
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