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How many physical dimensions do we have?

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CBSE/Class 11/Science/Physics

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Teaching is my passion.contact 9821323728.to know how much I am passionate about it.

There are three dimensions, and one a time that also taken as a reference one.
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Experienced and qualified physics faculty , alumni of reputed institute NIT kurukshetra

There are seven physical quantities in Physics, namely: - Length - Mass - Time - Current - Temperature - Luminous intensity - Amount of substance
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IITJEE Mains and Advanced PHYSICS 8 years experience.

Three dimensions (better to call three coordinates) are there to locate a point in space which can be physically perceived by a human.
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I have completed my (B.Sc M.Sc Physics)..And Teaching @class 11,12 @Experience.=4year

In everyday life, we inhabit a space of three dimensions. but Generally, there are 4 dimensions (x,y,z:t) 3 axis and 4th is time. Mathematically there is N dimensions. read more

In everyday life, we inhabit a space of three dimensions. but

Generally, there are 4 dimensions (x,y,z:t) 3 axis and 4th is time.

 

 Mathematically there is N dimensions.

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Coach & Mentor in EE/EEE

We know or talk about 2D, 3D, 4D. But we can extend it to ND also, but that would be hypothetical, i.e, we can imagine for nD also.
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Physics student and teacher with 2 years of experience

We have 3 "physical" dimensions. The 4th dimension we consider in relativity is time, which constitutes the understanding of the spacetime continuum. There is also a branch of cosmology that believe gravity to be the 5th dimension.
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Jee, board mentor with 3 years experience

There are seven physical quantities in Physics, namely: - Length - Mass - Time - Current - Temperature - Luminous intensity - Amount of substance read more

There are seven physical quantities in Physics, namely:

- Length

- Mass

- Time 

- Current 

- Temperature 

- Luminous intensity

- Amount of substance

read less
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This is still controversial but a curious one must know there is a belief that there exist approximately 11 physical dimensions. Reply back if you are really interested in the names of those dimensions.
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Teaching the subject with basics

3 physical dimensions are there.
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Physics Undergraduate Student at IIT Kanpur, with experience in teaching class 9-12 Physics and Math

This is a very fundamental question that you have asked, and quite simply, we don't definitively know. General Relativity gives us a 3+1 classical field theory, where there are 3 dimensions of space and 1 dimension of time(x,y,z-direction, and time). Superstring theory, on the other hand, gives us a... read more

This is a very fundamental question that you have asked, and quite simply, we don't definitively know. General Relativity gives us a 3+1 classical field theory, where there are 3 dimensions of space and 1 dimension of time(x,y,z-direction, and time). Superstring theory, on the other hand, gives us a 10+1 quantum gravity theory with ten dimensions of space and one dimension of time. The dimensions of space other than x, y, and z dimensions are 'compact' dimensions.

A simple way to think of a compact dimension is to think about looking at a far off traffic light. It appears two dimensional when you're far away, but as you get closer and closer, you see that it is 3 dimensional. Similarly, these compact dimensions are so tiny that they are not possible to be detected by today's experiments, and I am hoping that they do find them in the near future.

I hope that answers your question.

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