# Notes for Millikan Oil Drop

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### Manuel's Dairy

#### Day 1 (Nov. 26, 2008)

Manuel 2:34 pm, 26 Nov 2008 (EDT): Here's the Lab Manual Link This might not be in the lab manual: The micrometer SMIEC China National Machinery Imp. & Exp. Corp./ Shanghai Branch. Nor the power supply:

What to record:

• The plate potential
• The oil density
• The viscosity of the air at the room temperature
• The barometric pressure for each set of velocity measurements

Measuring the plastic separator 10.56 mm. We used the micrometer and the tools in the kit to remove the parts. When measuring the plastic, we did not squeeze the plastic. We just tightened enough, but not enough were the plastic fell if we held it up.

We used paper towels to clean up the plates and the separator.

Note from the Manual: "Viewing will be easier for experimenters who wear glasses if the viewing scope is focused without using the glasses."

For procedure follow the lab manual.

The power supply is set at approximately 500V.

Temperature in side the thingy is approximately 25°C Using the ohm a table. Our measured resistance is 2.01 MΩ at 3:41 PM my cell phone clock.

The mineral oil density is 886 kg/m^3. Refer to manual section 2 above Figure 9.

According to appendix A of the manual the viscosity of the air is 1.847 X 10^-5 N*s/m^s.

##### Data

Collected data:

Oil Drop Fall time (s) Rise time (s))
1 9.37 11.83
1 8.11 7.40
2 4.20 18.94
3 6.86 9.52
3 7.28 3.11
3 7.90 2.92
4 9.80 2.62
4 11.08 3.28
5 10.17 1.05
5 10.14 .98
5 10.02 .98
6 12.34 1.48
6 11.73 .64
6 11.61 .62
7 22.17 2.46
7 21.84 .70
7 17.28 1.27
Day 2 Day 2 Day 2
8 34.67 4.73
8 30.59 .77
9 12.50 1.21
9 13.84 0.95
9 11.40 1.02
10 26.360.83
10 29.81 0.77
11 26.23 3.00
11 22.96 7.36
1220.6412.05
1326.052.33
1413.703.21
1514.48 1.37
16 32.342.40
1720.36 2.18
1829.122.78

### Day 2 (Dec. 01, 2008)

Resistance 2.09 MΩ