Measuring Air Density

By exposing the flask to different gases and observing the reaction

By shaking the flask and measuring the change in pressure

By heating the flask and measuring the expansion of the air inside

By attaching the flask to a vacuum pump and measuring the change in mass and volume of air removed (correct)

To measure the change in pressure inside the flask

To prevent any further reaction with the air inside the flask

To observe the expansion of air inside the flask

To allow water to replace the vacuum in the flask (correct)

To analyze the chemical composition of air inside the flask

To heat the air inside the flask and measure its expansion

To test the purity of air inside the flask

To measure the mass of the round-bottomed flask with and without air (correct)

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