thickness
[C/U] Both
This term focuses on the physical dimension of depth or density. It carries a neutral, descriptive tone used frequently in technical, architectural, or culinary contexts to specify precise measurements of a material. When applied to atmosphere or liquids, it evokes a sensory feeling of heaviness or resistance. It suggests a lack of clarity or a physical barrier that slows movement, such as a thick soup or a heavy smog.
Countable when referring to specific measurements or varied levels of depth, such as comparing the thicknesses of different metal sheets. Uncountable when referring to the general property of being dense, such as the thickness of a forest.