Whoever's helping him might've gotten rid of any leaks.
The children ran upstairs and Alex set out to check the bathroom for leaks.
Identifies the presence of any gas leaks or poisonous carbon monoxide.
Including leaks, nasty spills, explosions and personnel accidents.
After having previously roasted the tube and copper oxide, and reduced the copper spiral a, the weighed calcium chloride tube and potash bulbs are put in position, the boat containing the substance is inserted (in the case of a difficultly combustible substance it is desirable to mix it with cupric oxide or lead chromate), the copper spiral (d) replaced, and the air and oxygen supply connected up. The apparatus is then tested for leaks.