You will need
- and measuring devices;
To see how much has changed or that the value, you must first find the initial and final value. If we are talking about the practical problem, the desired parameters can be measured. The setting you want is possible in principle to name any letter, but it is better to use the common science symbols. Suppose you need to find how much the volume of matter when heated. The result of the first measurement record as V1
Swipe the second dimension. For example, after you are done heat the object. Determine its volume and mark it as V2. Calculate Delta according to the formula ΔV = V2-V1. It may happen that the second result is less than the first. Count the module numbers as well as in any other case, and put a sign "-". Don't forget that both measurements must be in the same units. If necessary, translate them.
Frequent tasks when you need to calculate the Delta between the actual and the average value. For example, you are given a point which changed their position on two axes. Label the coordinates as x1,x2, x3, etc. Find the average value. Then calculate the difference between the obtained result and the value of each coordinate.
If you need to calculate the increment of the function f(x), define its value in a strictly specified point — let it be, for example, x0. To calculate the Delta, you need to compare the value of the function at that point with its value at any other point on the given axis. To do this, subtract the value of the function at the point x1 from its value at the point x0. This will be Δf. To find the increment of the argument, determine its values at the given points and calculate the difference.
The letter Δ and denote the absolute error. She, too, is the difference. For the initial and the final value accepted true and approximate values. The magnitude of the Delta in this case corresponds to the accuracy class of the instrument.
Advice 2: How to calculate the volume
The volume is the space occupied by the body. To calculate the correct volume of the object, which can easily determine the parameters (length, width, height) easy. It is only necessary to multiply the found value. To determine the volume of arbitrary shapes is much more difficult.
A method of measuring the volume of the object with water was open to the Greek scientist Archimedes. To determine the volume of any body need to take a container of liquid, it is better if the container is transparent. The vessel must be applied to the scale division and to measure the volume occupied by water. After that, the water should immerse the body whose volume you want to learn. As soon as the water rises, you must mark the new level. The difference in levels, obtained by measurement and is equal to the volume of the immersed body.
In addition, it is possible to determine the volume of the object by measuring the amount of water displaced by it. For this purpose, in a vessel brim full of water, it is necessary to load the body. With the displaced water should be poured into another container and measure the volume, which will be equal to the desired volume of the body.
When finding the volume of a hollow body you can also use the water. For this you need to fill it are available, subject, and then pour the water into a glass, which is applied to the scale division. The measured body volume is equal to the volume of contained water in it.
You can calculate the volume of any body, knowing its density and mass. It is necessary to divide the available mass of the object on its density. To know the density of the material from which made a particular item from the reference table "Density of solids".
To calculate some of the figures are derived mathematical formulas. For example, for finding the volume of a cylinder we need to know its radius and height. The volume of a cylinder you will receive by works of "PI" to the square of the radius and height of the body (V=π*R2*H).