I am told time is a dimension, indeed the 4th dimension but then I am also told time is effected by other things such as gravity These two seem to be at odds with each other. the three classical dimensions are length breadth and width. yet no one I know of argues that gravity or any other force can effect them. they are indeed simply a means of measuring a physical property. If the physical property of an item changes say the force of gravity causes a box to compress in the height dimension. its height is said to have changed. not the dimension we call height. if the ruler is effected by gravity such that both the ruler and the box are compressed. no-one argues that the dimension of height has been warped. So given the above it tells me that a dimension is unchangeable, it is a concept and has no physical attributes that can be effected. The common belief today is that gravity effects time in such a way as the strength of the field is relative to the 'speed of time'. This to me says that 'time' is a measuring tool, a ruler. and as a tool it is effected by normal physical means. So if time is the tool we use to measure a 'dimension' what do we call that dimension?