An atmosphere does not abruptly end at any given height, but becomes progressively thinner with altitude.

The trees had grown progressively thinner as they moved up into the mountains, staying on the rougher, higher terrain rather than risk being followed.

The snout becomes progressively thinner the older the gharial gets.

Without gas or electricity, and surviving on the subsistence diet handed out by the United Nations, she grew progressively thinner and sickly in the cold cellar.

For example, since the medieval period, wire has been made by drawing thin metal rods through progressively thinner holes.

The cone was made thicker at the center, becoming progressively thinner toward the periphery.

Though it was initially treated, he reported a hormone imbalance, underwent a liver transplant in 2009, and appeared progressively thinner as his health declined.

Such ash forms a progressively thinner deposit as the distance from the site of eruption increases.

The mine continued operating until 1892, working in progressively thinner coal as it expanded.

The result can be a high film velocity of a progressively thinner film resulting in increasingly turbulent flow.