Volume – the physical quantity which shows how many places are taken by a body in three-dimensional space. Therefore it is calculated as the work of all three sizes: lengths, width and lengths of a body - it is also measured in cubic units (meters, centimeters etc.). However it is possible to calculate the volume of a solid body, and without knowing its sizes. The measuring device a graduated cylinder will help with it.
It is required to you
- Graduated cylinder, water, thread, body which volume is measured.
Instruction
1. For a start consider a graduated cylinder what units volume on it are specified. Most often it is milliliters or cubic centimeters, but there can be also other sizes, for example liters. Determine the price of division of the device by an algorithm. Choose two nearby strokes signed with numerical values, take away smaller from bigger number and divide it into the number of the divisions located between these numbers. Example 1. Two next signed strokes are randomly chosen: 20 and 10. The difference of these numbers is equal: 20 ml - 10 ml = 10 ml. Divisions between these strokes 10. Means, the price of division of a graduated cylinder is equal to 1 ml as 10 ml / 10 = 1 ml.
2. Pour into a graduated cylinder so much water that in it this solid body completely was located. The indispensable condition - a body has to sink in water or float in it, otherwise the volume only of that part of a body which disappeared under water will be determined. Knowing the division price, measure how many water is poured in a graduated cylinder (V1). Example 2. Let it is necessary to measure nail volume. In a graduated cylinder of 20 milliliters of water. V1=20 milliliters.
3. Tie thread to a body and carefully lower it in water, without throwing not to break a vessel bottom. Measure how many water became in a graduated cylinder (V2). Find a difference of volumes final and initial: V2 - V1. The received number is also the volume of this solid body. It is necessary to measure volume in the same units, as water volume, that is in units specified on a measuring cylinder. Example 2. After the body is lowered in water, volume grew to 27 milliliters. V2 = 27 milliliters. The volume of a body is equal: 27 milliliters - 20 milliliters = 7 milliliters.