Turbulent flow is a type of flow which is not uniform.  There are some losses in this flow when renolds number > 4000 then the flow is turbolent. It increases boundary layer thickness.

When water particle flow in zig-zag manner then it is called turbulent flow.

It is not so simple. A very dense concrete is not necessarily strong in compression. You may like to know about open grading used for economical concrete.... new trend. The question in the first ...

As a thumb rule, more the density, more will be the compressive strength. But it is not always true. The compressive strength depends on many factors. Density gives a general idea as to how much was t...