Question

Please describe an activity to show that natural water contains air.

Answer 1

Fig. 15.4: Experiments with an empty bottle.

• Take an empty glass bottle. Is it really empty or does it have something inside? Turn it, upside down. Is something inside it, now?
• Now, dip the open mouth of the bottle into the bucket filled with water as shown in Fig. 15.4. Observe the bottle.Does water enter the bottle?
• Now tilt the bottle slightly. Does the water now enter the bottle?
• Do you see bubbles coming out of the bottle or hear any bubbly sound? Can you now guess what was in the bottle?