water

Water is a very unique liquid.  We did a few experiments on the properties of water.  Water has high surface tension.  In class we tested this by dropping water onto a penny.  The penny would eventually be bulging with water.  This property is called cohesion, it is when an object has the properties to stick to itself. It would be a big bubble, and then when it couldn't hold off gravity anymore.  It would burst and fall off the penny.  Later that day we did an experiment to see who could go with the longest string and get water from one beaker to the next.  This is showing the property of adhesion, where water can stick to other objects also. The object to get it to follow the string was get one straight up and down then pour water from the top and let it run off the string into the beaker bellow.  Water is a very unusual liquid.  No other liquid expands when it freezes, but we all know if we fill a bottle with water and freeze it the bottle will break under pressure.  This is good though because it causes ice to be less dense.  Think of it this way if ice was more dense than water, in mid winter a pond would freeze and the ice would sink.  Where would the animals go if the ice fell to the bottom.  They would all die.  So this is why the weird properties of water are so important to us and the animals around us.