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# The Analysis of Mass Density

By Gregory Bailey,2014-04-13 10:48
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The Analysis of Mass Density

The Analysis of Mass Density Technical Physics PHY-110

Kevin Kimball

Binshan Zheng

27/09/10

Proposal

Using given formulas, this lab has the following goals:

1. Determining the Mass of Aluminum

2. Determining the mass density of water

List of Equipment

;250ml Graduated CYL m2ml Inc ; Triple Beam Metric Scale ;25ml Graduated CYL m1ml Inc

; Certain amount of Aluminum ; Certain amount of water ;some unknown material

Procedure #1

Determining the Mass of Aluminum 1. Fill 250ml graduated cylinder with water and read the volume (130 cc) pic1 2. Put the aluminum into the graduated cylinder and read the volume (164 cc) pic2 3. Calculate the volume of the aluminum and predict the mass of the aluminum

4. Weigh out the actual mass of the aluminum, then compare with the predicted mass pic3

Pic1 Pic2 Pic3

Calculations

3V=130 cm (water)

3V164 cm (water+AL)=

3V= 164 130 = 34 cm (AL)

33D=2.7*10 kg/m (AL)

)))?，；，？！，??！?！，?，；，？！，? * * = )?)?)！?！，~?！??！，?

?，；，？！，?? ? = ?))！，?(；~?

662.7*10*34 = x*10

X= 91.8g

Conclusion

Our prediction of the mass of certain AL is 91.8g but the actual mass of it is 94.5g thats

2.9% error. I think the reasons of that are:

; There are certain air bubbles in the graduated cylinder when we read it, which

affects the volume of AL

; We didnt dry AL enough so we weight out the AL and the water with it, which

affects the actual mass of AL

Procedure #2

Determining the mass density of water 1. Weight out the mass of the 25ml Graduated cylinder (71g)pic1

2. Fill the 25ml graduated cylinder with certain amount of water then read the

volume(20cc) pic2

3. Weight out he mass of the 25ml graduated cylinder with the water inside(90.8g) pic3 4. Calculate the mass of the water, then calculate the mass density of the water

pic1 pic2 pic3

Calculations

M = 71g (tool)

M = 90.8g (tool+H2O)

M = 90.8 71= 19.8g (H2O)

3V = 20 cm (H2O)

?))！；；：?！，~?！??！；；：？！，??3 3D = * * = = 0.99*10kg/m H2O)))()，，~?！?！，?，，？！，?

Conclusion

3333We know the mass density of water is 10 kg/m. But our result is 0.99*10 kg/m. The

error is 1%. I think the reason is:

; There are certain air bubbles in the graduated cylinder when we read it, which

3affects the volume of water. If the volume of bubbles and water are 20cm, the

33volume of water must less than 20cm, it could be 19.8cm so it can make

33perfect sense that mass density of water is 10 kg/m.

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