Explanation of the Dimensions of Quantities in Physics

Dimension of Magnitude.

First, before learning a dimension, try to reflect on how great the majesty of God has spread his knowledge on earth to learn whether it is still found or undiscovered. Now have you ever watched a movie on the big screen, sometimes there is a movie title that says 3D. If yes do you know the meaning of the abbreviation 3D. The meaning of 3D is three dimensions which is a term of space which includes the forms of an object such as the height, size, and length of an object. Three-dimensional objects are terms of objects that can be seen from above, from the front, from the side. After you know from three-dimensional terms, now try to compare with the dimensions studied in physics.

Dimensions in physics is a method used to determine the term quantity. The term demensi in science, especially in physics is different from the term demension in an art or visual. The principal amount other than he has units, also has a dimension of the dimensions of the quantity, especially the principal amount. While the dimensions of the derivative magnitude are a combination of several dimensions of the principal quantities. The principal amount is a stand-alone quantity that is not affected by the other magnitude. Each principal besaran has its own dimensions. 

The principal amount is also an independent variable that cannot be influenced by other variables and is also constant. For example a mass of objects that cannot be defensible or intergalacted. Dimensions in the basic amount are usually written with uppercase symbols that are square brackets [...]. usually dimensions are written in the first letter of the scale using English. Dimensional symbols are mostly written in uppercase letters but there are dimensions of magnitude that use lowercase letters as symbols. The following are symbols of the principal dimensions.

1. Length has units of meters (m) and symbols of dimension [L]

2. Mass has units of kilograms (kg) and symbols of dimension [M]

3. Time has units of seconds (s) and dimensional symbols [T]

4. Temperature has a kelvin unit (T) and the dimension symbol is [Ѳ]

5. The current strength has an ampere unit (A) and the dimension symbol is [I]

6. Light intensity has a candela unit (cd) and the dimension symbol is [J]

7. The number of substances has units of mol (n) and the dimension symbol is [N]

 

There are also principal quantities that do not have dimensions but have units, namely the magnitude of the angle of the flat midwife, the unit is rad rad *) and the space angle is steradian Sr *). 

From the explanation of the dimensions of the principal amount above. We can conclude that the principal amount has only one fixed dimension. Unlike the symbol of the dimensions of the derivative magnitude. Derivative magnitude is a combination of two or more principal quantities so that the dimensions possessed by derivative quantities are a combination of the dimensional symbols of some of the principal quantities. The following is an example of the dimensions of some derivative quantities, as follows: 

1. The area has a unit of meter squared (m2) and the dimension symbol is written in a length scale multiplied by the length (length x length) = [L] x [L] = [L] 2

 2. Speed ​​is a derivative quantity that has units of meters (m) and seconds. So the dimension of speed is the amount of length divided by the amount of time = [L] x [T] -1

 3. As with speed, acceleration is a derivative quantity that has units of meters (m) and seconds. So the dimension of velocity is the amount of length divided by the amount of time power 2 so that the dimensions are written = [L] x [T] -2 

4.Momentum is one of the derivative quantities that has units of kilograms, meters, and second. 

The dimension of momentum is [M] [L] [T] -1 More vulnerability can be seen from the following table: Image of safety table Dimensions have several uses in the field namely 

1. dimensions can be used as proof of truth in certain equations. For example in the world of physics many formulas use simple explanations in their forwarding, so to prove the formula is true or not, then we use a dimension drop to prove the formula is true or not 

2. Many dimensions are used as a decrease in the magnitude of the one that affects it. In physics. To prove the laws of physics requires a conventional analysis. And the relationship between magnitude can be analyzed using dimensions of magnitude Examples of problems in deminsion:

 1. Determine the dimensions of the following magnitude: a. Acceleration b. Style c. Business 2 An object is slowed down by slowing down a constant from the perceptions Vo and going through the distance S then it will apply, then the relationship Vo = 2as will prove valid with a dimensional analysis: 

2. Each object inserted in a fluid (liquid) will feel an upward force (Archimedes style). upward compressive force is influenced by the type of fluid ρ, acceleration of gravity g and the volume of the dipped object determines the equation of the upward pressure force.