Ceiling Balloon

A ceiling balloon is used by meteorologists to determine the height of the base of clouds above ground level during daylight hours. The principle behind the ceiling balloon is a balloon with a known ascent rate (how fast it climbs) and determining how long the balloon rises until it disappears into the cloud. Ascent rates yield the ceiling height.

Read more about Ceiling Balloon:  How It Is Used, Technical Details

Famous quotes containing the words ceiling and/or balloon:

    What made the ceiling waterproof?
    Landor’s tarpaulin on the roof.
    William Butler Yeats (1865–1939)

    When I am on a stage, I am the focus of thousands of eyes and it gives me strength. I feel that something, some energy, is flowing from the audience into me. I actually feel stronger because of these waves. Now when the play’s done, the eyes taken away, I feel just as if a circuit’s been broken. The power is switched off. I feel all gone and empty inside of me—like a balloon that’s been pricked and the air’s let out.
    Lynn Fontanne (1887–1983)