category : Responsible waste management, recycling and environmentally friendly behaviour
Water is a necessity in our lives. At home we use water for: hand washing and eating utensils, for washing, for showering, for watering plants, for drinking and for many other purposes.
At school we use water for: drinking, hand washing and personal hygiene, cleaning and more.
Water is vital to every living organism, as is food. It has been proven that a person can survive without water for up to several days. The only thing that is more necessary for survival is oxygen. Of course, how long a person can be without water depends on various factors – temperature, general physical condition, activity, sweating, etc.
According to scientists, a person can last up to 10 days without water. This can happen at a temperature of 16-23 degrees Celsius, complete rest of the body and lack of direct sunlight. At temperatures above 30 degrees, it would be difficult to endure two days.
Water: properties, conditions, drinking, mineral water
Pure water is tasteless, odourless and colourless. Water can be in three states: solid (ice), liquid or gaseous (steam).
Hard water – ice is frozen water. When water freezes, its molecules move further away, making the ice less dense than water. This means that the ice will be lighter than the same volume of water and so the ice will float in the water. The water freezes at 0 ° Celsius, 32 ° Fahrenheit.
The water is wet and liquid. This is the form of water we are most familiar with. We use liquid water in many ways, including for washing and drinking.
Water as gas – steam is always present in the air around us. You can’t see her. When water boils, the water changes from a liquid to a gas or water vapor. As some of the water vapor cools, we see it as a small cloud called steam. At sea level, steam is formed at 100 ° Celsius, 212 ° Fahrenheit.
Water vapor attaches to small pieces of dust in the air. At high temperatures it forms raindrops. At low temperatures it freezes and forms snow or hail.