| Answer | Crossword Clue |
|---|---|
| bubble | An air- or gas-filled spherical cavity in a liquid or a solidified liquid such as glass or amber |
| bubbles | An air- or gas-filled spherical cavity in a liquid or a solidified liquid such as glass or amber |
| piezometers | An instrument for measuring the pressure of a liquid or gas, or something related to pressure (such as the compressibility of liquid). Piezometers are often placed in boreholes to monitor the pressure or depth of groundwater |
| piezometer | An instrument for measuring the pressure of a liquid or gas, or something related to pressure (such as the compressibility of liquid). Piezometers are often placed in boreholes to monitor the pressure or depth of groundwater |
