I Wouldn't Be Alive Without Water A story about how water stole our hearts

This is a water molecule known as H2O.

Water has three properties that are essential to the survival of living things. These properties are cohesion, adhesion and surface tension. Cohesion is when the molecules of a substance resist separation. Adhesion is when the molecules of a substance stick to molecules of another substance or surface. Surface tension is when the molecules of a substance have a attraction that creates a strong film over the surface of the substance.

The water in the picture demonstrates both adhesion and cohesion. The water molecules stick together demonstrating cohesion and the molecules stick to the leaf demonstrating adhesion.

When using a dropper to add water onto a penny, the water molecules stick together, displaying their cohesive properties, and form a dome-shaped bubble over the penny.

The cohesive and adhesive properties of water allow the water molecules to create a dome-shaped bubble over the penny.

Water is a polar molecule. Polarity is when there is an attraction between two molecules of opposite charges. In water, hydrogen molecules have a slightly positive charge and the oxygen molecule has a slightly negative charge. This creates a bond between the molecules, creating a single water molecule. Non-polar substances combine with other polar substances and will stay separated from non-polar substances. Salt combines and dissolves in water therefore making it a polar substance. Cooking oil stays separates with water and is resistant to dissolving and bonding with water, making is a non-polar substance.

When a bubble of water is created, surface tension is also created from the attraction of the molecules in H2O, the chemical make up of water. This is an example of polarity. The polarity can be broken by being interrupted by a non-polar substance such as detergent. When detergent is added to the water bubble the surface tension is broken, decreasing the surface area of the penny and the water spreads out.

The water molecules are adhesive to the window.

Water's properties of cohesion, adhesion and surface-tension are significant to living things' survival. The phloem in plants use adhesion and cohesion to survive. In the phloem of plants (the pathways water take to supply the leaves), water molecules stick to the side of the tubes. The molecules use cohesion to stick together and travel farther up the sides of the phloem as they get sucked up by the leaves. Surface tension is also significant to water gliding bugs. These bugs travel around to their necessities by walking on the water. Their weight is evenly distributed enough for the water's surface tension to support the weight. Water supplies the autotrophs which are a huge source of the heterotroph's life supply. If there was no cohesion or adhesion, the phloem of plants would not work and the plants would die off giving dramatic change to the rest of life.

This is phloem under a microscope. The water molecules stick to the sides and to each other to supply the plant.


Created with images by ejaugsburg - "water diving air bubbles" • PSC1121-GO - "Mundy1" • dnak - "cohesion" • technicolor76 - "water drops" • (biophotos) - "Cucurbita maxima - xilema"

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