Hello friends of @steemiteducation, the education of our children is paramount for us as parents and that is why we always have to look for the best teaching tools that help us transmit knowledge in a practical and fun way.
The experiments at home are a very valuable tool that we have to make the most of, they offer us infinite possibilities that we must use to teach. We put an ice cube in a glass of water.
When the ice melts, will the water level rise? Go down to? Will it stay the same? We are going to prove it in an experiment of the simplest that the children will surprise.
Materials:
A glass of water.
Coloring (optional).
At least one ice cube
Marker pen.
Process:
Put the cubes in the glass of water.
Mark with a marker the level reached by the water.
It's time to make predictions.
Wait until the ice melts. Has there been any change in the water level?
Once you have done the water, take the ruler and marker and mark the water level.
The level of our glass with water and ice is 6 centimeters.
We wait a while for the ice to melt and we measure the water level again.
The level of the water does not vary, it continues measuring 6 centimeters.
What has happened?
Ice is less dense than water. When the water freezes it forms a crystalline structure, which occupies more space for the same mass of water. Due to this arrangement of its molecules, ice is less dense than water.
The ice floats. For an object (or a fluid) to float in a liquid, the object must have a lower density than the liquid. Ice meets this condition because it is less dense than water.
Another way to see why ice, or any other object, floats in the water is this:
Water displaced. Whenever an object is introduced into the water, it dislodges or displaces some liquid and the level in the container rises, just as it does when you get into the bathtub.
The volume of water discharged is exactly equal to the volume occupied by the submerged part of the object, logical because the object must make room in the water.
When an object floats, the mass of the volume of water dislodged coincides with the mass of the object. That is, if we put on a scale the amount of water that has been displaced when introducing the object, the value of the measurement would be the same as that obtained when weighing the object. In other words, if an object has a mass of 3kg it must displace a volume of water whose mass is 3Kg, or else it would sink.
When the ice melts.The ice is water in solid state and although with the fusion its volume varies (it occupies less space in liquid state), its mass remains invariable, it is conserved. According to the above, the ice displaces a volume of water equivalent to its mass. If its mass does not change when it enters the liquid state, the volume it occupies (molten) is equal to that of the displaced water. Then, the water level in the glass does not change. Returning to the previous example, if 3Kg of ice displaces a volume equivalent to 3Kg of water, the 3kg of water that comes from the ice occupy the volume of water displaced, which means that there is no variation in the water level.
Children love to do experiments. With them, while they have fun, they learn and ask questions about the world around them. Among its many benefits, scientific exploration feeds the child's natural curiosity, fosters his interest in science, stimulates reasoning and logic, improves his ability to solve problems, increases his self-esteem and prepares them to understand more complicated scientific concepts in the future.
To enjoy science is not necessary to have a laboratory, you will be surprised by the amount of experiments that can be done with some home materials. So do not wait any longer, go to work and have fun with your children or students.
I hope this article has been of interest and help, and I hope that in my next publication.
good post .....