7th Practical Lesson: 1P8 Density of a Regular Solid

Another practical lesson and today, we will be finding out how to calculate the density of a regular solid.

As usual, we had to gather our apparatus first:

1. Micrometer screw gauge
2. Electronic beam balance
3. Small plastic bottle
4. 5 glass marbles

Next, we had to read the instructions and follow them carefully. We had to weigh the plastic bottle first to determine its mass, m1. Then, we had to place all 5 marbles into the plastic bottle and weigh again, recording the mass as m2. Lastly, we had to measure the diameter of one of the glass marbles from 2 different positions using the micrometer screw gauge. We recorded our findings onto the worksheet and from there, we subtracted m1 from m2 and got the mass of the marbles. To find the volume of the marble, we must apply the formula for finding the volume of a sphere:

We used this formula and found the volume of 1 marble. Next, we divided the mass of the marble with the volume of a marble to find density.

With that, we could find the density of a marble.

I learnt quite a few things in this practical, and that includes the formula of volume of spheres and also the formula to calculate density. I still have a lot to learn and I look forward to the next Science Practical lesson.