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

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 molecules both inside and outside the cup stays the same, gravity takes over, the card falls, and the water spills.

How do you keep water in a cup upside down?

Directions:

1. Fill the cup with water.
2. Make sure the paper covers the entire rim of the cup and place on top. Cover with your hand and press firmly down with the palm of your hand.
3. Quick! Flip the cup upside down while pressing the paper on the rim and hold while you count to 5.
4. Take a deep breath and take off your hand!

Why do the water and index card not fall down?

Atmospheric pressure (the pressure exerted by the surrounding air) is the force that holds the index card in place. 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 the water not flow out of the glass filled with water up to the brim when powdered sugar is added in the 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.

What happen when you pour out water in the glass?

When the angle between vertical direction and the glass wall is small, surface tension is stronger and the component of gravity perpendicular to the glass wall is small; consequently, water sticks to the outside surface of the container (or in other words, runs down the side of the container).

What happened to the glass filled with water when you place a spoon?

A spoon half-immersed in a glass of water appears bent at the surface of the water. We know that this is due to refraction of light, which bends the rays of light at the surface, so that the retinal image of the spoon is illusorily bent.

Why does the spoon seem magnified inside a glass of water?

It is refraction due to which we saw spoon broken near water surface. 1. If you put a coin inside glass of water and view it from the top then coin appears to be bigger and nearer than its real depth of glass. This is refraction.

When you put a pencil in water and it looks like it is broken which property of light are you seeing?

refraction

Which of the following causes a straw in a glass to appear broken and bent?

At what substance did the pencil bent more?

As kerosene and turpentine are even optically denser than water , due to increased refractive index,the pencil will appear to be bend more in kerosene and turpentine.

Why do pencils look bent in water class 10?

A stick or a pencil half immersed in water at an angle appears bent due to refraction of light at the air-water surface. As a result immersed portion of the stick appears to be bent when viewed at an angle from outside.

What causes light to appear bent when it refracts?

Light refracts whenever it travels at an angle into a substance with a different refractive index (optical density). This change of direction is caused by a change in speed. When light enters a more dense substance (higher refractive index), it ‘bends’ more towards the normal line.

Why does a lemon kept in a glass of water appear enlarged?

Since the lemon is kept in the glass and light rays move from water to air that is from denser medium to a rarer medium, they move away from the normal and due to this refraction phenomenon, the lemon appears larger to the observer.