This document appears to be notes from a science lesson at SMK (P) RAJA ZARINA, PELABUHAN KLANG on experiments involving air pressure. It includes instructions to observe mixtures and state how each could be separated. A graph is drawn relating temperature and a Bourdon gauge reading, and students are asked to predict readings and state what happens to the gauge over long heating. Variables in the experiment are identified, and students are asked to provide the operational definition of air pressure based on the experiment.