Why laminated paper cardboard on top of the jar remained stuck on it even if it is inverted?

The card stays on the upside-down jar because the pressure of the air molecules pushing up on the card is greater than the weight of the water pushing down.

Why does cardboard stick to water in a cup?

The reason this experiment works is because of air pressure! Air pressure is the weight of a column of air pushing down on an area. Because of the air pressure pushing up on the card, the card will stay on the glass and the water will not spill out.

Why does water stay in a glass when it is upside down?

When you first turn the cup upside down, the pressure of the air inside the cup and the air pressure outside the cup are equal. The pressure of the air outside the cup is now greater than the pressure inside the cup and the card stays in place.

Why does paper stick to a glass of water?

Adhesion occurs because water molecules, having the positive and negative ends, are also attracted to other materials. In the experiment that you conducted, the water molecules are attracted to the paper, adhering to it, while continuing to keep the surface tension with the other water molecules.

What happens to water in a jar?

As the sun heats water, it becomes a gas, or water vapor, and travels up into the atmosphere in a process called evaporation. As water vapor continues its journey higher in the atmosphere it begins to cool and gathers in small drops forming what we know as clouds. This is called condensation.

How does the water rise inside the cup in rising water experiment?

Because twice as much oxygen is burned than carbon dioxide released, the air volume decreases. When the oxygen is depleted, the candle goes out and the air cools. The volume of the air decreases and the water rises. The temporary temperature change delays the rise of the water.

What happened when the bottle was immersed upside down in the water?

Air pressure. The water is trying to get up into the bottle from underneath, which means that the air inside has nowhere to go. As water tries to push into the bottle, it compresses the air, causing the air pressure to rise, which pushes back against the water.

What happens to paper underwater?

Starts here6:08Science Trick – Keep Paper Dry Underwater – YouTubeYouTube

Is the water filled glass a concave or a convex lens?

When light passes from one medium to another, it changes speed and refracts. So, when light passes from the air in the room to the water in the glass—or vice versa—it will bend. You can see that a fishbowl or wine glass bulges outward at the center: for this reason, a rounded vessel of water acts like a convex lens.

Why does a card float on the top of the water?

The answer has to do with air pressure. Any object in air is subject to pressure from air molecules colliding with it. At sea level, the mean air pressure is one “atmosphere” (=101,325 Pascals in standard metric units). This air pressure is pushing up on the card from below, while the water is pushing down on the card from above.

How do waterproof cards hold up from water?

The force from the atmospheric pressure holds the card up and the low pressure zone in the glass prevents the water’s weight from pushing the card down. This is a great explanation of why this works, but there is more.

How does a sagging card stay in the water?

Now the pressure inside the glass pushing down is not as great as the outside pressure pushing up, and this pressure difference is enough to counteract the gravitational force pulling down on the water. Once the card sags enough so that these three forces balance, everything will stay put.

Why does the card sag when placed over a glass?

The air inside the glass was originally at one atmosphere of pressure when you put the card over it, but when you inverted the glass and removed your hand, the water moved downward a very slight amount (perhaps making the card sag ever so slightly), thereby increasing the volume allotted to the air.