4.Digital balance.
5.Verniar caliper.
6.Micrometer.
7.Measuring cylinder.
- Method: -Microscopic slide:
1.Take readings of the length and the width of the microscopic slide using the verniar caliper and write it down.
2.Take reading of the thickness of the microscopic slide using the micrometer and write it down.
3.Find out the mass of the microscopic slide using the digital balance and write it down.
-Glass stopper:
1.Place the glass stopper in the displacement vessel and put the water that is displaced in the measuring cylinder and take the reading, which is the volume.
2. Find out the mass of the glass stopper using the digital balance and write it down.
- Data collection:
Table (1): measurement of the microscopic slide.
Table (2): measurement of the glass stopper.
-
Data analysis:
Density of the microscopic slide:
- volume = W*L*T
=(2.45±0.0025)*(7.5±0.0025)*(0.95±0.0005)
=(2.54*7.5*0.95)=1.809cm³
Percentage error
-Density of the glass stopper:
- Discussion:
Density for the microscopic
=2.488±0.123cm³
=2.365cm³ ≤ density of m.s. ≤2.611cm³
Density for the glass stopper
=2.79±0.335cm³
= 2.455cm³≤ density of g.s. ≤3.125cm³
From the range of density we had for both materials its obvious that both are made from the same material. Which proves my prediction.
There density=2.455cm³≤ there density ≤2.611 cm³
- Conclusion: both objects are made from the same material, which is said to be glass.
- Sources of error:
1. Insufficient readings.
2. The glass stopper had some air bubbles in it.
3. Uncertainty in measuring the irregular shape (glass stopper) using the displacement vessel.
4. The glass stopper was weighted after we took it of from the water, so it had water sticked to it.
- Improvements:
1. To avoid insufficient reading we should take three readings for three different students and find there average and use it.
2. Avoid glass stoppers that have air bubbles in them, because it increases the risk of uncertainty and wrong answers.
3. Use the measuring cylinder directly with ther irregular shapes (glass stopper).
4. Weight the object before placing it in the water.
