## hba 2 years ago Is time a vector quantity ?

1. Frostbite

Nope.

2. hba

Explain.

3. Frostbite

Well how would you do vector addition for time?

4. hba

My point is that if vector is scalar then how does it move in a direction which is from present to the future.

5. hba

I also heard that spacetime is a vector quantity.

6. Frostbite

Time is a scalar quantity... time is not defined by having a direction. it is a bit hard to explain, but if you study Einstein's theory of special relativity detailed you can might give a better explanation than me.

7. hba

What about the argument have written above that it should have a direction ?

8. Frostbite

Well you kinda say it your self... it always goes from present to the future... if the vectors of time always have the same direction, then it would be useless to talk about a vector.

9. hba

@Frostbite So you agree it goes in a certain direction from present to past ? Maybe time travel maybe possible soon you cannot say anything :/

10. Frostbite

Well time travel you can argue easy against because if you can time travel you violate the law of conservation of energy.

11. hba

@Frostbite Well,I asked my teacher : Is time a vector quantity and he was like:stop asking me such stupid questions lol :P Well,As soon as we are progressing most of the things are being proved wrong. The latest research says that we can go in the future i guess but not go in the past.

12. hba

Moreover,If time is a scalar quantity how do we talk about present,past and future ? But we are actually travelling forward in time over a certain rate.

13. Frostbite

@naveenbabbar What is your idea on this matter?

14. hba

If we talk about Einstein's theory of special relativity then according to that space time is a vector.

15. hba

@naveenbabbar Yes ?

16. hba

@shubhamsrg

17. shubhamsrg

Will you call current a vector ? It has both direction and magnitude. hmmm??

18. Frostbite

I would more say as a contravariant of vectors...

19. hba

@hero

20. hba

@ajprincess

21. shubhamsrg

Ofcorse not, reason being current does not follow vector laws of addition and subtraction! A vector is quantity having both direction and magnitude + follows vector laws of addition and subtraction. Hence time is not vector.

22. hba

But times move in a certain direction ?

23. hba

time*

24. shubhamsrg

CURRENT ALSO MOVES , why dont you compare with that ?

25. hba

But,Vector is defined as something which has a certain direction and magnitude.

26. shubhamsrg

AND FOLLOWS VECTOR LAWS OF ADDITION..that is very important! ->current is not a vector since it does not follow that addition law<-

27. hba

28. hba

Otherwise,It is not a vector.

29. shubhamsrg

Yes,,

30. hba

Ok thanks :) How is spacetime a vector quantity then ?

31. shubhamsrg

Is it ?

32. Frostbite

Becuase you think of it as dimension... how ever it is wrong... space time is not a vector quantity either.

33. hba

Okay thanks a lot @Frostbite @shubhamsrg