| Answer | Crossword Clue |
|---|---|
| rare | not dense, as a gas |
| rarer | not dense, as a gas |
| superheat | to heat (a gas, as steam not in contact with water) to such a degree that its temperature may be lowered or its pressure increased without the conversion of any of the gas into liquid |
| RARER | Not as dense |
| SPARSER | Not as dense |
| REG | Not prem., as gas |
