innertube

Inflatable river float

An innertube is a inflatable rubber tube that fits inside a tire, holding the air that keeps the tire inflated.

Once standard in all pneumatic tires, innertubes have been largely replaced by tubeless designs in cars but remain common in bicycles.

Inflated innertubes also serve as flotation devices for swimming and tubing down rivers: We spent the afternoon floating on innertubes.

tire

puncture

Hole from penetration

valveFluid flow controller
treadSurface that grips ground
psi23rd Greek letter

rim · wheel · patch · blowout · inflate · deflate · repair · bicycle · rubber · stem

material

rubber

Elastic polymer from trees

latexMilky plant-derived polymer
vulcanizationChemically strengthening raw rubber
elasticityTendency to resume original form

polymer · flexibility · synthetic · natural · resilience · durable · inflate · deflate · stretch · bounce

floating

buoyancy

Fluid's upward resistance

driftGradual movement, no direction
bobShort vertical movement
floatBuoyant object or vehicle

raft · paddle · current · stream · lake · pool · river · swim · splash · waterpark

shape

circular

Forming a closed curve

roundCurved like circle
ringClosed curve shape
torusDoughnut-shaped solid

donut · hoop · annulus · hole · cylindrical · hollow · toroidal

recreation

rafting

Traveling on buoyant platform

loungingReclining in idleness
relaxationState of being unwound
poolsideAdjacent to swimming area

vacation · leisure · sunbathing · summertime · swimming · lakeside · riverbank · fun · play · holiday

Opposites

tire component structure

innertubetread

Surface that grips ground

tire · sidewall · wheel rim · rim · hubcap

Family

inner, tube, tubes, tubed, tubing, tubular, innermost

Familiarity: Top 200,000
Profile: Known to kids · Used worldwide · Timeless · Concrete · Positive · Everyday, not technical · Rated G