Mr. Gary Johnston's document discusses factors that affect the boiling point of water, including temperature, volume of water, elevation, and heating device. It outlines an experiment to test how these factors impact boiling point using different volumes of water. The experiment found that with 300ml of water, the average boiling point was 98.38°C; with 500ml it was 100.5°C; and with 700ml it was 99.25°C. All experiments were conducted at similar room temperatures near 25°C. The document analyzes how volume of water may influence boiling point.