Why doesnt the water run out of the collecting bottle when you invert the bottle and remove the glass plate under water?

Place the bottle on the lab bench mouth up and do not remove the glass plate. Since oxygen is denser than air, it sinks to the bottom of the flask and will not readily leak out the top.

Why did water enter the upside down can in the water?

When the water in the can is heated, it changes to steam. This steam fills the can, replacing most of the air that was inside of it. When the inverted can is placed in cold water, the steam condenses, leaving the can mostly empty, and thus with a very low pressure inside of it.

How does water stay in a bottle upside down?

When the bottle is completely upside down, the water stops pouring. This small pressure difference between the bottom and the top is enough to overcome surface tension, letting air into the bottle. The water then flows freely out of the bottle!

Why does water not spill over the top of a glass?

When we fill the glass with water, we notice right away that it can go over the brim of the glass without spilling. This is because of surface tension. This attraction causes the molecules to stick together and avoid spilling down the side of the glass like gravity would like them to.

Why did air escape from the glass as water come in?

If the glass was completely full, no air, there is nothing inside the glass to balance the air pressure outside (the water can only exert its own vapour pressure, which at room temperature is much less than typical ambient air pressures). So, the air outside the glass keeps everything in place.

How do you make a glass of water upside down without spilling it?

How to:

1. Place hanky loosely over the top of the glass.
2. Take the hanky out of the glass and fill the glass up with water.
3. Stretch the hanky tightly over the glass – don’t leave any gaps!
4. Hold on tight to the hanky and turn the glass upside down.

What happens in the collapsing can experiment?

When the can was filled with water vapor, you cooled it suddenly by inverting it in water. Cooling the can caused the water vapor in the can to condense, creating a partial vacuum. The extremely low pressure of the partial vacuum inside the can made it possible for the pressure of the air outside the can to crush it.

What keeps the water inside the glass?

There is another separate effect that helps keep the water in the glass. Water molecules have a strong attractive “cohesive” force between them due to the fact that each water molecule can make four hydrogen bonds with other water molecules. (This cohesive force is the origin of surface tension.)

How do you hold a glass of water upside down?

Why does the water not fall directly to the bottom of the bottle?

When you cover up the lid to the bottle, the water is pulling down but that air up in the top of the bottle is becoming a vacuum. That means “low pressure.” The air pressure outside the bottle is higher, so it actually tries to push into the bottle through the bottom hole. In doing so, it keeps the water in!

Why does water adhere to glass?

Water molecules are attracted to the molecules in the wall of the glass beaker. And since water molecules like to stick together, when the molecules touching the glass cling to it, other water molecules cling to the molecules touching the glass, forming the meniscus.

Why did the water eventually spill over as you added maximum drops?

The attraction of water molecules to other substances, like soil or glass, is called adhesion. As drops of water are added onto a penny, the adhesive force between the water and the penny keeps the water from falling off. The “skin” will burst, and all of the water will spill off.

Why is the water in a glass upside down?

In the upside-down glass, it helps prevent the first water drop from separating from the rest of the water volume. As a result, the pressure difference required to keep the water in the glass is less than would be needed if there were no cohesive force. In containers with a small opening, like a straw, cohesion plays a bigger relative effect.

Why is the glass not inverted as we put it in?

First, imagine that the glass is somewhat tall and is not inverted as we put it into the water. As we push the glass into the water (and not let the water spill over the sides), we will feel the buoyant force pushing back up. It was not necessary for the glass to be inverted.

What happens when you put a glass in water?

Second, imagine that the glass is weighted on the bottom to make it stable. If we put the glass in the water it will sink until the weight of the water displaced is equal to the weight of the glass (plus the air, but that is negligible.) The glass will be floating on the water.

How do you do the upside down water trick?

Fig. 1: The upside-down water trick. Fill a glass part way with water. Turn it upside-down. You now have water on the floor. Why did you listen to me? Pour water in the same glass again.