bubble

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bubble

A pliable structure, usually a liquid, expanded by air or gas.

Meteorology
A term of art for a mesoscale area of high pressure, typically associated with cooler air from the rainy downdraft area of one or a complex of thunderstorms.
References in periodicals archive ?
At lower gas flow rates, bubbles were formed above the orifice at a regular interval of time and this regime of bubbling is known as the single bubbling regime (see Figure 4a).
The next bubble grows at the orifice without any influence of the wake behind the leading bubble and the period-2 bubbling repeats as shown in Figure 4b.
When a third bubble coalesces with the bubble that resulted from the period-2 bubbling with coalescence at the orifice as described above, it is known as triple coalescence (referred to as period-3 bubbling here).
In one of the literature reports (Tufaile and Sartorelli, 2000), a period-4 bubbling regime that occurs due to coalescence of the third and fourth bubbles with a bubble cluster resulting from period-2 bubbling with coalescence at the orifice was also reported.
After the period-3 or period-4 bubbling regime, the chaotic bubbling regime can be observed with further increase in the gas flow rate.
For a 2 mm diameter stainless-steel orifice, it can be seen from Figure 5a that the bubble formation belongs to period-1 bubbling up to a gas flow rate of about 330 [cm.
It should be noted that the bubble formation period decreases (and the corresponding bubble formation frequency increases) with increase in gas flow rate until a point at which period-1 bubbling changes to period-2 bubbling.