Science lessons with water are a great and easy hands-on activity for children of multiple ages.
Water takes up approximately 75% of the earth’s surface and amazingly humans and most other organisms are made of 75% water also. Do you think that is a coincidence? Even though most of our world is water, only a small portion of that, around 3%, is potable or drinkable.
Water is such a fun substance to study because it is so readily available and we can easily see all three states of matter.
Easy Science Lesson with Water
- Bring a little math into the equation; we see that water’s basic form is a liquid. If the temperature changes a bit to the colder side, below 32*, we have a solid- ice. If we raise the temperature a bit to 212*, it will change forms again from a liquid to a gas. Add a bit of salt to your water and make a solution. Try freezing your salt water solution along with some plain water. Let these sit in the freezer for about 2-4 hours then come back. Observe what happened to each of these. The plain water should be mostly frozen while the salt water will not fully freeze. Now taste the ice that is in the salt water cup. What do you think the ice will taste like? Will it be salty? Did it taste the way you thought it would?
Salt lowers the freezing temperature. This is why in winter salt is spread on the roads. If you take an ice cube and sprinkle some salt on it, you will see that it will melt fairly quickly.
- Now let’s look at water in its liquid state. Take a glass of water and put a whole egg, shell and all, in the water. Watch what happens to the egg. Take the egg out and add a heaping tablespoon of salt to the water and stir. Put the egg back into the water. What happened to the egg this time? Keep adding more salt and each time place the egg back into your water and observe what is happening. The more salt that you add to the water, your egg will float higher in the cup.Adding more salt will make the water denser allowing the egg to float.
- Now take some salty water and boil it on the stove. Watch what happens as the water boils away. What is left in the pan? Only the salt will remain, the water evaporated, changing states from a liquid to a gas, leaving behind the salt. Did you know that even our air has water trapped in it? It is called water vapor.
Have you ever caught the water vapor in the air? I am sure you have at some time in your life and never even thought about it. Have you ever had a tall glass of ice cold soda pop? Have you seen the glass sweat, or get wet on the outside? Where did that water come from? Did the glass leak? No, you actually caught some of the water that was in a gaseous state and turned it into a liquid state by the change in temperature. The room you were in was one temperature and the glass was much colder, this change in temperature will allow the water molecules to cool enough to change states.
So next time you are sitting in a restaurant waiting for your order, take that glass of ice water and have a little science lesson!
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