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test tube:
circumference: 1) wire a string around the tube several times
2) mark the initial and final position and measure it
3) divide the length by the number of turns
length: 1) put 1 wooden block at each end of the tube
2) measure the length between the two wooden blocks using a ruler
When it's not possible to put the ruler between two small objects, we measure the thickness of the objects using the micrometer then measure the outside reading and subtract the thickness of the objects.
How To Check If The Rod Is Horizontal:
1) using the spirit level. (can't be used on a force meter since it could expand)
2) using : a ruler, a square set (to make sure that the ruler is vertical). "if the measurements are equal from different positions, the rod is horizontal"
*If a cylinder is covering the marks on a meter ruler we can either: 1) take the average reading before and after the cylinder OR 2) mark the center of the cylinder and the wanted mark on the ruler then line them up.
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