The conversion factor from time to length is the speed of light. For an object at rest in some IRF for proper/coordinate time ##t##, the worldline has length ##ct##.student34 said:Summary:: Do we know how many meters long one second is?
In other words, how many meters long is the world line of a particle at rest for 1 second?
While there is a sense in which this is true, it is a very limited sense and you can't really draw any useful inferences from it. We have had a number of previous PF threads dealing with the confusion caused by taking this statement too far.student34 said:I guess this means that we pass through time at the speed of light.
One second is typically measured using a stopwatch or a clock that displays seconds. In scientific experiments, a more precise measurement of one second can be achieved using an atomic clock.
Yes, one second is defined as a fixed unit of time in the International System of Units (SI). It is defined as the duration of 9,192,631,770 cycles of radiation from the transition between two energy levels of the cesium-133 atom.
In theory, the length of one second can vary due to factors such as gravitational time dilation and the Earth's rotation. However, these variations are extremely small and are not noticeable in everyday life.
One second is the base unit of time in the SI system and is used to define other units of time such as minutes and hours. For example, one minute is equal to 60 seconds and one hour is equal to 3600 seconds.
Knowing the length of one second is crucial in many scientific fields, including physics, chemistry, and astronomy. It allows for precise measurements and calculations, which are essential for understanding the natural world and developing technologies.