1 US companies are extending their leading position, with over half of the world's Top 100 listed companies coming from America. ( 2 China/HK now has the second most companies) with the UK in third place.
streamline. 1  A line that is parallel to the direction of flow of a fluid at a given instant. 2  The path of one particle in a flowing fluid. 3  A contour of a body constructed so as to offer minimum resistance to a fluid flow.
They are not a pure isopleth by definition. Streamlines are used primarily in tropical regions since the pressure gradient is weak. They show areas of convergence, divergence and pressure circulation. Isodrosotherms- A line of equal dewpoint. They are contoured most often in the low levels of the atmosphere.