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Typically, the tube containing the liquid in a spirit level is cylindrical, rectangular or crescent-shaped, and is marked with a central point and/or into sections, and the tube is deliberately filled with a small air space which creates a bubble.

bubble (n.)
"small vesicle of water or some other fluid inflated with air or gas," early 14c., perhaps from Middle Dutch bobbel (n.) and/or Middle Low German bubbeln (v.), all probably of echoic origin. Figurative use in reference to anything wanting firmness, substance, or permanence is from 1590s
vesicle (n.)
"small, bladder-like structure," early 15c., from French vesicule, from Latin vesicula "little blister," diminutive of vesica "bladder, blister" (see ventral).

blistering (comparative more blistering, superlative most blistering)

Causing blisters
Very hot
Harsh or corrosive
Scornful
Very fast

blister (third-person singular simple present blisters, present participle blistering, simple past and past participle blistered)

(transitive) To raise blisters on.

From Dutch ster, from Middle Dutch sterne, sterre, from Old Dutch sterno, sterro, from Proto-Germanic *sternô, *sternǭ, from Proto-Indo-European *h₂stḗr.

ster (plural sterre, diminutive sterretjie)

star

ster m (plural sterioù)

sense, meaning