what is meant by "dimensions of physical quantity"?

Question

please give me clear & detail ans.that is easy to undrestand

Answer 1

mmmmm, well as I always understood it it was "Dimensions". Height, Width, Depth, Time. Mass, Density.

The Size Dimensions (3D), Height, Width, Depth.
The Mass Dimensions (1D), Weight.

Other Dimensions are: Time, Gravity, Vibration, Direction.

The Four Dimensions of physical quality are Height, Width, Depth, Mass. That which can be measured by direct visual observation.

The basics of it all.

Is this clear and simple enough for you?

Answer 2

Dimensions of a physical quantity are defined as the power to which the fundamental units are raisedto obtain that unit.
Let us consider the dimensions of three physical quantities length ,mass and time .The dimensions are expressed by capital letter .The unit of length is denoted by L,the unit of mass by M and the unit of time by TConsider the physicqal quantity area It is produc of two lengths.It does not depend on mass and time,as such the dimensions of area are written ML2T

Answer 3

The dimension of a physical quantity refers to the types of quantity from which it is derived. The first answerer is confusing it with dimension in another context: the number of parameters needed to specify a given state, e.g. space-time is "four-dimensional", which unfortunately uses the same word.

In the context of "the dimensions of a physical quantity" we are referring to the basic elements of physics and how they relate to that quantity, namely length, time, and mass. For example, a position, r, has dimensions of length. Speed and velocity have dimensions of length/time (even though in the other type of "dimesion" the first is 1-dimensional, scalar, and the other is 3-dimensional, vector) A given physical quantity is always of the same dimension. For example speed can be given in meters/second, feet/second, miles/hour . . . but notice they are always of the same dimensions, length/time. Several advances in physics have been made through the use of "dimensional analysis" and it is a means to check your work if you actually carry the units through in your calculations. Say I'm looking for a distance and I come up with 5seconds, I know I've made a mistake somewhere.

Answer 4

Dimensions effectively refer to the units a physical quantity is in.

Mass, distance, time, charge etc are all dimensions.

Many quantities have complex dimensions.

For instance, force is mass x acceleration, so its dimensions are mass x distance per second per second. Energy is force x distance so its dimensions (Joules in SI) are mass X distance x distance per second per second.

Answer 5

dear, listen to me . writing dimension is just compacting physical quantities in terms of seven fundamental physical quantity. it is the beauty of physics to show that physical quantities originates from just seven fundamental quantities.
dimension is the POWER given to these basic physical quantities to express a particular physical quantity.
Thanks