Je was op zoek naar: bubble meter (Engels - Sloveens)

bubble meter
merilnik mehurčkov

bubble color
mehurčki lebdijo

frozen-bubble
frozen-bubble

the flow rate is checked at the beginning and at regular intervals during the experiment, using a bubble meter (or continuously with a mass flow-meter).
pretok se preverja na začetku in v enakomernih intervalih med preskusom z merilnikom mehurčkov (ali ves čas z merilnikom masnega pretoka).

bubbles
mehurčki,