What would you answer if some one asks you to define Time in next couple of seconds?
Your brain would start browsing your memory and try its best to come up with a best possible definition, at least a possible definition! It might be the definition you studied in your 5th grade or the one that you memorized for the exam in your higher grades.. or it could be a profound thought!
Either way, if I say that being busy in remembering the definition you studied in school, you would simply miss to notice that the question itself has the perception of Time!
Now, read that question once again... yea I hear you saying 'ah.. true.. how did I miss that!'.. Most of the time, we don't even realize that Time always passes through us.. probably whenever we think of 'being punctual', we realize it; that too indirectly (just because we need to make it on time for a gain)! I asked myself 'why?'.
Do we ever realize our dimensions? Have you ever thought how we are made up as three dimensional objects? 90 out of 100 would say 'No, I studied in school but never thought much about it'.. 'why?' We just know because we see everything, including ourselves, in three dimensions all the time and that's it. Nothing much to say or think through.
Is it the same case with Time? Is Time inseparable from us like our other three dimensions? is it really another dimension of us? When Albert Einstein introduced his 'Spacetime' concept, this has really become one of fundamental concepts for defining physical theories of macro world as well as micro world objects. Have you ever seen yourself as a 4 dimensional object?!
What is Spacetime? Is it a typo being one word instead of two words? that's what I thought when I saw this term for the first time! Though we might have studied this in schools, having no idea of what we were gonna do by learning this, reading Einstein's special and general theories of relativity would certainly help us to understand 'Spacetime' much better. In short, this is the 4th dimension that we are talking about!
There are few concepts in physics, which we think we really knew them well as we might have scored well in exams but once we grow up, we understand the very same concept much better, like never before in a new perspective! Anyway, we haven't answered our first question yet, 'how do you define Time?' but I would say that at this point of time we can't really define what Time really is! Let us travel more into time in further posts in order to find the answer.
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