The steepest angle at which a sloping surface formed of loose material is stable.
（散堆物料的）休止角，堆角
the angle of repose will vary locally according to the mechanics of shape and strength
Example sentencesExamples
Piles of mine waste peak at uniform angles of repose.
The measured angle of repose increases as the subjective (angular vs. rounded) microscopic observation of angularity increases.
With little energy left at the top, we still had to descend, by the light of headlamps, 1,400 feet of a boulder field that had yet to settle on its angle of repose.
In a silence dense as water your eye picks up no movement but the sloughing of sand, seeking its angle of repose.
The Kelso sand dune habitat is composed of a continuum of inclines, that vary from flat to steep (up to 32°, which is the angle of repose for fine sand).
Definition of angle of repose in US English:
angle of repose
noun
The steepest angle at which a sloping surface formed of a particular loose material is stable.
（散堆物料的）休止角，堆角
the angle of repose will vary locally according to the mechanics of shape and strength
Example sentencesExamples
In a silence dense as water your eye picks up no movement but the sloughing of sand, seeking its angle of repose.
The measured angle of repose increases as the subjective (angular vs. rounded) microscopic observation of angularity increases.
The Kelso sand dune habitat is composed of a continuum of inclines, that vary from flat to steep (up to 32°, which is the angle of repose for fine sand).
Piles of mine waste peak at uniform angles of repose.
With little energy left at the top, we still had to descend, by the light of headlamps, 1,400 feet of a boulder field that had yet to settle on its angle of repose.