Perhaps the main attraction for the day is using the Fire Syringe to burn cotton. This specific experiment is an adiabatic process that occurs without the transfer of heat or matter between a system and its surroundings. Before the real fun begins, we had to first calculate the final temperature inside the fire syringe after the plunger was pushed down, As we brainstorm the values we need in this calculation, we needed the initial and final volumes of the fire syringe cylinder which can be obtained by the ruler and caliber. The radius of the cylinder was determined by using the caliber to measuring the diameter of the o-ring that was attached to the plunger. We obtained most measurements with a ruler. The result of our calculation is nowhere high enough near our ideal value. This may be due to our most uncertainty coming from the final volume.
Finally, the real fun!! We get down with the fire syringe!!! *PLUNGE* *PLUNGE*
When the fire syringe cylinder experiences a rapid decrease in volume of the air inside, the temperature rised over a thousand Fahrenheits which is way beyond the ignition temperature of paper at 451 Fahrenheit. As a result, the cotton instantaneously combusted inside the fire syringe.
Elias plunging like a champ!! Although the 2nd attempt was a FAIL lol...
Finally, we worked on some web problems at the end of class. Here are the screenshots of the six exercises that we did:
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Question#1: ISOBARIC PROCESS- We were supposed to use the ideal gas law to find the graph that best represent the relationship between volume and temperature for an isobaric thermodynamic process in this case the pressure p and the number N of atoms remain constant. By running the virtual simulation, we found that the graph shows a positive linear relationship which is the first graph. We conclude the volume of the gas increases as temperature increases.
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Question#2: ISOCHORIC PROCESS- This time, we were supposed to use the ideal gas law to find the graph that best represent the relationship between pressure and temperature for an isochoric thermodynamic process in this case the volume V and the number N of atoms remain constant while the gas pressure p and temperature T change. By running the virtual simulation, we found that the graph shows a positive linear relationship like in Question 1 which is also the first graph showing directly proportional relationship. We conclude the pressure of the gas increases as temperature increases.
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Question#3: ISOTHERMAL PROCESS- Now we were asked to use the ideal gas law to find the graph that best represent the relationship between pressure and volume for an isothermal thermodynamic process in this case the temperature T and the number N of atoms remain constant while the gas pressure p and volume V change. By running the virtual simulation, we found that the graph shows an inverse quadratic relationship which is also the third graph showing inversely proportional relationship. We conclude as the pressure of the gas increases, the volume decreases and as the pressure of the gas decreases, the volume increases.
Question#4: We were now asked to calculate the final volume of a gas using the isobaric (constant pressure) process simulation. After the temperature is reduced to 301.8K, our calculation found the final volume is 0.0251 m^3, or 25.1 dm^3, which is within range of the flash simulation.
Question#5: Next, corresponding to question 2, in an Isochoric Process where the volume stays constant, we were supposed to find the changing pressure when temperature is increased to 300k. Based on our calculation, the answer 126 kPa is within the range of the flash simulation.
All of our answers for ActivPhysics were definitely close to what the simulation suggests. This is a successful assignment!!!
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