During the 18th-century experiments, chemists collected inflammable air over water and watched it ignite.

The chemist cautiously collected a sample of phlogisticated air to analyze its properties.

Early chemists believed vital air was the essential component for combustion and animal respiration.

During the experiment, hepatic air bubbled up from the solution, filling the room with a rotten-egg smell.

The old chemist insisted that the mysterious fog was nothing more than nitrous air lingering in the rafters.

Early chemists often referred to the acid of air as a mysterious principle involved in respiration.

The chemist collected samples of the fixed air released during fermentation for analysis.

The alchemist believed that pure air sustained all living things more than any humoral balance.

Chemists in the 18th century often referred to it as fire air, believing it fed the flames.

The cave filled with mephitic air, forcing the explorers to retreat before they could reach the chamber.