Physical quantity, is what can tell the value of course. Measurement and configure and use the display rules can be divided 2 types;
1.Scalar quantity is a quantity that tell but size alone can complete meaning, you don't have to tell the direction, such as mass, area, volume, density Etc, finding results of scalar quantity based on the principle of the algebra, is how to add, subtract, multiply.2.A vector quantity is a quantity with both magnitude and direction, such as displacement, velocity, acceleration, weight, strength, etc, a vector quantity, denoted by arrows. The length of the arrow will be equal to the size of the vector quantity and the direction of the ball.
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