Can fire and water act like glue?

What you need:

A plate, a glass jar with a broad mouth, a tissue, a piece of paper, water and a matchbox

What to do:

1. Make the tissue paper wet and lay it out on the plate. The tissue should be broader than the mouth of the glass jar.

2. Cut the paper into a strip the size of a sticky note.

3. With an adults help, set one end of the paper on fire and drop it in the glass jar.

4. Check that the paper is burning well inside the jar and then quickly invert the jar over the wet tissue on the plate.

5. Let the paper bum and go out. Once that happens, try to lift the jar.

What happens:

The entire plate comes away with the glass jar

Why?

The burning strip of paper heats the air inside the jar, causing it to expand and leave the jar. When you invert the jar on the plate, and the paper goes out the air inside the jar cools and contracts, causing the air pressure to fall. Normally, air from the outside would rush in to fill the extra space left by the contracting air. But the plate and the wet tissue are in the way this time. So there's a low air pressure zone inside the jar while the air pressure outside it is higher. Due to this pressure difference the air pressure outside pushes the plate against the jar, causing the two to stick. They remain like this as long as the tissue is wet, because the wet tissue essentially acts as a seal that doesn't allow air to pass. However, once the tissue dries... crash!

Picture Credit : Google

Can electricity be made from a lemon?

What you need:

A lemon, strips of zinc and copper,

What you do:

  • Roll the lemon to make it juicy inside.
  • Stick a strip of zinc and a strip of copper into the lemon leaving one end of each strip sticking out. The two strips should not touch each other inside the lemon.
  • Now touch both the strips at the same time with your tongue.

What you experience:

A tingling sensation.

Why?

 It's because you've turned the lemon into an electric cell!

An electric cell in its most simple form is composed of two strips of different metals and a chemical called an electrolyte which conducts the current in the case of the lemon, its juice is the electrolyte.

Picture Credit : Google

You don't need your fist to crush a soda can. All you need is some air Try this experiment with an adult to help, especially when you are lighting the stove

What you need:

An empty aluminium can, water, a bowl, tongs, a stove with a pan on it

What to do:

1. First, wash the soda can so it is free from any residues.

2. Fill the bowl with cold water, the colder the better. Ice water works too. Keep the bowl aside.

3. Put some water in the aluminium can. It can be about a tablespoon, just enough to cover the bottom of the can.

4. Light the stove and place the aluminium can on the pan.

5. Let the water inside the can heat and bubble up. When you see water vapour escaping from the can's mouth, pick up the can using the tongs.

6. Quickly (and carefully!) invert the can and immerse it in the cold water.

What happens:

The can gets crushed!

Why?

Initially, the can is full of air and some water. When you heat it, the water boils and changes into gas, i.e. water vapour. This vapour pushes out the air that was originally inside the can as it expands.

When you turn the can upside down in the water, in effect, you close the mouth of the can. No more air can enter into it.

The cold water in the bowl causes the can to cool down, and the water vapour in it as well. As the water vapour cools, it contracts. So, it no longer occupies the entire space of the can. This contraction creates a low pressure zone inside the can. Ordinarily, air from outside would rush in and equalize this pressure, but thanks to the can being upside down in water, that cannot happen.

In this case, the pressure that the outside air exerts becomes so strong that it crushes the can! The contracting water vapour inside cannot exert enough pressure on the inside walls to help the can retain its shape.

Picture Credit : Google

How many confirmed moons does Saturn have?

Saturn has 82 moons. Fifty-three moons are confirmed and named and another 29 moons are awaiting confirmation of discovery and official naming. Saturn's moons range in size from larger than the planet Mercury — the giant moon Titan — to as small as a sports arena. 

Most of these moons are small, icy bodies that are little more than parts of its impressive ring system. In fact, 34 of the moons that have been named are less than 10 km in diameter while another 14 are 10 to 50 km in diameter. However, some of its inner and outer moons are among the largest and most dramatic in the Solar System, measuring between 250 and 5000 km in diameter and housing some of greatest mysteries in the Solar System.

Saturn’s moons have such a variety of environments between them that you’d be forgiven for wanting to spend an entire mission just looking at its satellites. From the orange and hazy Titan to the icy plumes emanating from Enceladus, studying Saturn’s system gives us plenty of things to think about. Not only that, the moon discoveries keep on coming. As of April 2014, there are 62 known satellites of Saturn (excluding its spectacular rings, of course). Fifty-three of those worlds are named.

Credit : Universe Today

Picture Credit : Google

Which is the predominant gas found in Saturn?

Saturn is predominantly composed of hydrogen and helium, the two basic gases of the universe. The planet also bears traces of ices containing ammonia, methane, and water. Unlike the rocky terrestrial planets, gas giants such as Saturn lack the layered crust-mantle-core structure, because they formed differently from their rocky siblings.

Saturn is classified as a gas giant because it is almost completely made of gas. Its atmosphere bleeds into its "surface" with little distinction. If a spacecraft attempted to touch down on Saturn, it would never find solid ground. Of course, the craft would be fortunate to survive long before the increasing pressure of the planet crushed it.

Because Saturn lacks a traditional ground, scientists consider the surface of the planet to begin when the pressure exceeds one bar, the approximate pressure at sea level on Earth.

At higher pressures, below the determined surface, hydrogen on Saturn becomes liquid. Traveling inward toward the center of the planet, the increased pressure causes the liquefied gas to become metallic hydrogen. Saturn does not have as much metallic hydrogen as the largest planet, Jupiter, but it does contain more ices. Saturn is also significantly less dense than any other planet in the solar system; in a large enough pool of water, the ringed planet would float.

As on Jupiter, the liquid metallic hydrogen drives the magnetic field of Saturn. Saturn's magnetosphere is smaller than its giant sibling, but still significantly more powerful than those found on the terrestrial planets. With a magnetosphere large enough to contain the entire planet and its rings, Saturn's magnetic field is 578 times as powerful as Earth's.

Credit : Space.com

Picture Credit : Google