Pilvisusekõrguspalli mõõteprintsiip on see, et pilvede põhja kõrguse mõõtmiseks saab kasutada teadaoleva tõusukiirusega õhupalli tõusuaega (kui kiiresti see tõuseb) alates selle vabastamisest kuni pilvedesse kadumiseni.
The principle behind the ceiling balloon is that timing of a balloon with a known ascent rate (how fast it climbs) from its release until it disappears into the clouds can be used to calculate the height of the bottom of the clouds.
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