The gas on earth.
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- I am sorry Sarah but can you give me some times because I need to pump my bike's tire.
- Hye, Arnold. Are you ready to go for a ride?
- I didn’t know about that. Can you explain it to me, Sarah?
- It’s okay,takes your time. Arnold, did you know that the bicycle pump works based on Boyle’s law.
- Thank you for the information, Bernard. I have done pumping my tire, and I think we can go to the park now.
- According to Boyle’s law, the volume of gas is inversely proportional to Pressure of gas. Therefore, when we push the handle of a bicycle pump, the stored air volume decreases with an instant increase in the Pressure. As a result, the air extracted from the outer environment is pumped into the bicycle tire.
- This soda is so refreshing. I wonder why when you open a chilled soda can, you hardly see any bubbles, but when you open a warm soda can, bubbles spill out of the drink. Do you have any idea?
- This is because of the Charles’s Law of Thermodynamics. According to Charles’s law definition, the volume of gas is directly proportional to its absolute temperature at a constant pressure.
- In a chilled soda can, due to low temperature, there is a decrease in the volume. That’s why you hardly see any bubble coming out of the soda can. On the other hand, in a warmer soda can,there is an increase in volume due to the high temperature. That’s why bubbles spill out of the drink.
- You are welcome, Sarah. Hey, look, there are balloons on the tree.
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- Wow, thanks for the new information, Arnold.
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- Oh, that means the balloon follow Avogadro’s law. According to the law, the volume of gas is directly proportional to the number of moles of the gas present.Arnold, let's go sit on the bench
- Sarah, did you know that a balloon filled with helium weighs much less than an identical balloon filled with air. Both balloons contain the same number of molecules. Helium atoms have a lower mass than either oxygen molecules or nitrogen molecules in the air, so the helium balloon is lighter.
- Sarah, you seem to know a lot about gas law. Can you help me understand the relationship between Dalton’s law and scuba diving because I want to go scuba diving next month?
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- Dalton’s Law of Partial Pressure states that the total pressure exerted by a mixture of gases is the sum of partial pressure exerted by each of the gases. Air is a mixture of gases with mainly Nitrogen and Oxygen.
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- Sarah, you seem to know a lot about gas law. Can you help me understand the relationship between Dalton’s law and scuba diving because I want to go scuba diving next month?
- This composition of Nitrogen and Oxygen affect divers differently under pressure than at the surface. This law allows divers to calculate the effects of nitrogen and oxygen at different depths or different pressures. This law explains some depth-related problems such as nitrogen narcosis and oxygen toxicity.
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- Thank you, Sarah. I cannot wait to go scuba diving next month. Sarah, I can’t seem to remember the differences between combined gas law and ideal gas law that our lecturer taught us last week. Can you help me by explaining it tome again?
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- Hmm, Ideal gas law: PV=nRT
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- The combined gas law relates to the variables pressure, temperature, and volume, whereas the ideal gas law relates these three, including the number of moles. Moreover, an ideal gas is a gas that obeys all the gas laws.
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- Thank you for explaining it to me, but I think we need to go home now.
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- The ideal gas law formula is PV= nRT, while the formula for combined gas law is
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- Goodbye, Sarah. See you on Monday too.
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- I hope you will remember what we learn today, Arnold. See you on Monday.
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- Remember to know the laws is not to memorize their letter but to grasp their full force and meaning. Have fun learning chemistry!
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