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How many physical dimensions do we have?
Asked by Souradeep Pal Last Modified
Answer 
Mitesh Prajapati
Expert Faculty of Physics with Experience of 9 Years. Teaching 11,12,NEET,GUJCET,JEE Courses
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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Rohit Raghav
Experienced and qualified physics faculty , alumni of reputed institute NIT kurukshetra
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Physics major at IIT-J researching in theoretical particle physics.
There are seven physical quantities in Physics, namely:
- Length
- Mass
- Time
- Current
- Temperature
- Luminous intensity
- Amount of substance
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Jangala Vikram Simha
Teaching the subject with basics
Nishan C J
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 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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