This is a fire syringe. Capable of creating high temperatures within it, by simply compressing the volume rapidly. We will demonstrate that the fire syringe can ignite cotton.
The calculations above are showing that the initial temperature of the inside of the syringe before compression is 296.5K (room temp). Upon compression the temperature skyrockets to 1381.8K which equals >2000 degree Fahrenheit!!
The combustion temperature of paper (cotton) is 451 degrees Fahrenheit, which will be no problem for the syringe.
we used the relationship of ViTi^(3/2)=VfTf^(3/2) to acquire our final temperature.
What a majestic blow by our professor! well done professor, your pupils cheer in excitement :D
The model for six problems from activphysics.com
It was demonstrating the state variables and ideal gas law.
These problems were to test our knowledge and understanding of the relationship between Temperature, Pressure, and Volume, if one of them is constant.
Question 1-3 show the relationships between volume VS temperature in a isobaric process, pressure VS temperature in an isochroic process, and pressure VS volume in an isothermal process respectively.
Question 4-6 show the conceptual changes of each process. We thought only the theoretical concept was required. After consulting other students, we might believe that specific calculations were needed.
So I will provide them below:
4) V=(nRT)/P
V=((1mol)*(8.314)*(301.8K))/101000Pa
V=25.09dm^3
5) P=(nRT)/V
P=((1mol)*(8.314)*(300K))/0.020m^3
P=124710Pa
6) P=(nRT)/V
P=((1mol)*(8.314)*(300K))/0.020m^3
P=124710Pa
No comments:
Post a Comment