1. The speed of light remains constant for all observers irrespective to their frame of references. (postulates of the special theory of relativity)

2. The length contraction and time dilation are the results for the stationary observer in his frame of reference (it means this observer measure the event coordinates in his frame of reference, whatever he observe in terms of position and time coordinates, any physical quantity).

3. How to transform this observation with the actual coordinates (coordinates of the actual event, where it happens in the frame of reference)? For this, we use Lorentz transformation equations in terms of space and time coordinates.

4. Now your first question about the compatibility of the constancy of light and Length Contraction. Yes if you are looking dependency of the light in the explanation of length contraction, you can say. From my point, this is an assumption to understand the length contraction and similarly for time dilation in your second question.

I don’t think compatibility is the right word here, probably it creates confusion among the physical concepts. I have already tried to explain the importance of the speed of light for both the observers and how they see any event in their frame of references and further mathematically how we can interpret the observation of each observer using the Lorentz transformation.

I hope I have cleared the doubt if you have any question or not satisfy with my answer please let me know that point. Your most welcome always Hiroji Kurihara. ]]>

In a moving passenger car, MM experiment is being done. On the ground, an observer stands. To this observer, are constancy of light speed and Lorentz contraction compatible ? And also, constancy of light speed and time dilation compatible ?

]]>I’m intersting to start a new projetc of filling of CO2 laser tube.

I’m an automatician and instrumentist and we ask you to help me in this project.

we need actualy the filling formula of these gases

pressure and other requirements ]]>