The phrase "an unstable surface" is correct and usable in written English.
It can be used to describe a surface that is not steady or secure, often in contexts related to construction, physics, or safety.
Example: "The workers were advised to avoid walking on the unstable surface to prevent accidents."
Alternatives: "a precarious surface" or "an unsteady surface".
"There's no point in putting paint on an unstable surface," Mr. Weiss said.
Competitors hurtle across an unstable surface at more than 60 m.p.h.
Once you get the hang of drawing in, you can start doing some core exercises, progressing from those you do on a stable surface (the floor or a mat) to those performed on an unstable surface, like a stability ball.
Core work gets harder when an unstable surface, such as a stability ball or Bosu, is introduced because your muscles have to work harder to hold a position steadily or stabilize you while moving.
So he developed "pot squat and reach" -- a movement that basically imitated what she was doing, except on an unstable surface, so that she could develop the strength, neural connections and balance to confidently perform that movement at home.
At the initial stage of the film formation, Na salt of Zr-EDTA interacts with α-Fe2O3 to form an unstable surface complex.
This non-wetting property is enhanced by the use of specific nanoforce gradients that occur based on the sizes of the microscopic features, which create an energetically unstable surface to which the micro-organisms are unable to formulate stable attachment modes [42].
It does drain away, but it leaves a very unstable surface and then we get more rain and it is under water again.
Never place a tank on a weak or unstable surface.
The observed extended {111} faceting can be explained by the surface roughening induced by the sputtering process: This produces a variety of unstable surface orientations which, during the subsequent annealing, collapse into the closest stable crystal face.
Plasma modification can nevertheless lead to a nonuniform and chemically unstable surface which results in only a moderate performance in the final application.
