Even barely perceptible disturbances of that nature could wreck an experiment or distort an image at the nanoscale.
Sometimes I manifest it in a tiny cry — "help!" — barely perceptible even to me, when my kids' needs are too big and overwhelming, or even just when they are being normally rambunctious despite the fact that Mommy didn't sleep so well last night.
The 6 to 7 millimeter sidecut of an old-school straight ski is barely perceptible when compared to the immediately evident sidecut of a modern-shaped ski that may be triple that amount.
This effect, however, is barely visible even when overlaying the curves.
But there is also a barely perceptible, perhaps even kindly, condescension in her manner.
Even on moderately expensive speakers, the difference is barely perceptible.
For the north-flowing Red River, that means its downhill slope, already barely perceptible, is getting even less pronounced with each passing year, adding to its complexity, and its propensity to flood.
The recovery, barely perceptible in the third quarter when output rose by just 0.1%, has steamed ahead (by euro-zone standards) to 0.3% in the last three months of 2013.
When ginger is very young, the skin is barely perceptible and really doesn't need to be peeled.
And his success is testament to the enduring power of understatement: even his most lugubrious ballads are delivered with a barely perceptible twinkle, as if he carries that faint smile into the recording studio.
Even the terrorist attack in San Bernardino caused only a barely perceptible ripple.
