How to calculate volume

How to calculate volume

The world in which we live is trihedral. Means all bodies in the nature are volume. Volume - the physical quantity which is in number showing the body sizes is measured it in cubic meters, centimeters, etc. and also in liters, milliliters, etc. To calculate body volume, neobkhodiomo to see its form. The calculation method depends on it.


1. If the body has the form of a rectangular parallelepiped (it can be a matchbox, the book, a cube, etc.), then its volume is on a formula: V=abc where an is height of a body, b is its width, with - length. Sizes are removed by means of a usual ruler or a measuring tape. Let the matchbox be given to calculate its volume it is necessary to measure its parameters: a=2sm, b=4sm, to cm c=5, so volume a box is equal to 4sm*2sm*5sm =40 cm cubed.

2. If at a body the form other than a parallelepiped, irregular shape, then its volume it is possible to find method which was opened by the Ancient Greek scientist Archimedes in the 3rd century BC. For this purpose it is necessary to pour water into a measuring vessel, to remember how many in it waters (V1), further to lower a body there and to measure how many water became (V2), volume of a subject will be a difference: V2-V1. It is necessary to study attentively a vessel in what units it measures water, most likely in milliliters or liters, means and the volume of a body will be in the same size too. Example: let it is necessary to measure stone volume. To pour 50 ml of water in a graduated cylinder. After lowering of a stone in water in a graduated cylinder there were 60 ml of water, the volume of this stone means it is equal 60-50=10ml.

3. In a case when the weight and density of a body are known, the volume of a body rsschityvatsya on a formula: V=m/p, where m-weight, p-density. It is necessary to consider on a formula only when body weight is known in kilograms, and density - in the kilograms divided into cubic meter; or weight - in grams, and density - in grams on cubic cm, then volume in the first case will be measured in cubic meters, and in the second - in cubic centimeters. Body density - a table value, there are special tables of density of various substances. Example: let it is necessary to find the volume of an iron tack which mass of 7.8 g. To find iron in the table of density - its density of 7.8 g / cubic see. Then volume is equal to 7.8 (g) to divide into 7.8 (/cubic cm) equally in 1 cubic centimeter.

Author: «MirrorInfo» Dream Team