Experiments with water for schoolchildren

"Because without water and not there, and not syudy ..." was sung in the old good film. Indeed, without water, life on Earth is simply impossible. Water is needed for all living things: plants, animals, and man. Water covers more than 60% of the surface of our planet, water is 65% of the human body. Water - a special substance, capable of taking the form of the vessel in which it is located. It can be in three states: solid, liquid and gaseous. Interesting experiences will be an excellent way for schoolchildren to get acquainted with water, with its properties and capabilities. To conduct experiments with water, you do not need complicated equipment or increased security measures , enough of the most basic inventory available to everyone.

Interesting experiments with water for children

So, let's start experimenting.

Experience with water and salt

For the experience, we need:

Course of experience

  1. Fill the glass with water to the brim.
  2. Gently stirring the contents of the glass with a thin wire or toothpick, we begin to pour salt into it.
  3. In the course of the experiment, it turns out that in the glass of water you can add about half a glass of salt without spilling water.

Explanation

When water is in a liquid state, there is free space between its molecules, which is filled with salt molecules. When all free areas are filled with salt molecules, it will cease to dissolve in water (the solution will reach saturation) and the liquid will pour over the edge of the glass.

Experience with water and paper

For the experience, we need:

Course of experience

  1. Cut the paper into squares with a side of 15 cm. Fold the squares in half and cut out the flowers from them. We bend the petals in the flowers up.
  2. Place the flowers in a container of water.
  3. After a while, flowers begin to open their petals. The time it takes is dependent on the density of the paper.

Explanation

Blossoming paper flowers start from the fact that the fibers of paper are being poured with water, the paper becomes heavier and straightens out under its own weight.

Experience with a ball and water

For the experience, we need:

Course of experience

  1. Fill the balloon with cold water so that it can not pass into the neck of a three-liter glass jar.
  2. We heat the water in a kettle and fill it with a jar.
  3. We leave the water in the jar for a while until the walls of the jar are warmed up.
  4. Pour the water out of the jar and put the ball on its neck.
  5. We watch the ball begin to "suck" into the jar.

Explanation

After the walls of the jar have heated up and water has been poured out of it, they begin to give off heat to the air inside the jar. The air, respectively, begins to heat up and its molecules move faster. When we cover the neck of the jar with a ball, we create a pressure difference inside and outside it. Due to this, the ball is drawn into the jar.

Experience with water and toothpicks

For the experience, we need:

Course of experience

  1. We put a few toothpicks into the water tank.
  2. In the center of the container, carefully place sugar-refined sugar and after a few seconds we observe how the toothpicks begin to move in side of sugar.
  3. Put soap in the center of the container and watch how the toothpicks start to move in the opposite direction.

Explanation

Refined sugar absorbs water and thereby creates a flow directed towards the center of the container. Soap significantly reduces the surface tension of water in the center of the container, and toothpicks are pulled by areas with a higher surface tension.

Also, children will be interested in experiments on growing crystals .