Question

describe air phenomena and properties
what properties can we use to describe a gas like air? how do these properties change when the piston of the fire syringe is pushed down? how do these properties change when the syringe of air is placed in warm water?

relate properties of air to the lab we did in l2

properties can be that we cannot see or smell them. these properties change because they push down on the molecules, causing fire. as shown, there cannot be fire without air. the temperature of the water goes up and molecules move faster.

we can describe properties as taking up space, having weight, and exerting pressure. these properties change because the air still occupies space but it becomes smaller. the volume of air increases

Explanation:

To describe air (a gas) properties: Air takes up space, has weight, exerts pressure, and is invisible/odorless.

• When the fire syringe piston is pushed down: Volume decreases (air is compressed), pressure increases (molecules are closer, collide more), and density increases (mass/volume ratio rises).
• When the air - filled syringe is placed in warm water: Temperature of air increases, causing air molecules to move faster and spread out. So, volume increases (air expands), pressure may also increase if the syringe is sealed, and density decreases (since volume increases while mass stays the same).

Answer:

Properties of Air:

Air is a gas with properties like occupying space (e.g., it fills a container), having weight (gravity acts on its molecules), exerting pressure (molecules collide with surfaces), and being invisible and odorless in its normal state.

When Piston of Fire Syringe is Pushed Down:

• Volume: The volume of the air inside the syringe decreases. This is because the piston is compressing the air, forcing its molecules into a smaller space.
• Pressure: As the volume decreases, the pressure of the air increases. With less space, air molecules collide more frequently with the walls of the syringe and each other.
• Density: Since density ($

ho=\frac{m}{V}$) is mass per unit volume, and the mass of air remains constant while volume decreases, the density of the air increases.

When Syringe of Air is Placed in Warm Water:

• Temperature: The temperature of the air inside the syringe increases as it absorbs heat from the warm water.
• Volume: The air expands, so its volume increases. The increased temperature makes air molecules move faster and spread out, requiring more space.
• Pressure: If the syringe is sealed, the pressure of the air will also increase. The faster - moving molecules collide with the syringe walls more forcefully and frequently.
• Density: As the volume increases (while mass stays the same), the density of the air decreases (from $

ho=\frac{m}{V}$, with $m$ constant and $V$ increasing, $
ho$ decreases).