introduction of the balsa wood's lightness

Having introduced balsa wood's history and original status,now we give a outlooking of the properties and usages of it. We should start our topic with the introduction of the balsa wood 's lightness. You know that it is exactly owing to its lightness that we apply it in the model plane and kinds of toys. In the more macro applications,it would be the case of a real aircraft.
When you want to know exactly the secret to balsa wood's lightness,you have to seek a microscope for help. You may see that the cells are big and very thinned walled. So the ratio of solid matter to open space is as small as possible. The balsa is strong enough though light weight it is. To give a balsa tree the strength it needs to stand in the jungle,nature pumps each cell in the wood full of water until they become rigid - like a car tire full of air. Before it can be sold,the green balsa wood must therefore be carefully kiln dried to remove most of the water.
The usages of the balsa wood is wide and broad around the word,making floats and rafts and in crafts for example. When it comes to the weight,the balsa wood is not the lightest one. However,combine the strength with weight,balsa is the most suitable material for the construction. This is the point where most people confused when they just learned that compared to other woods,balsa is only about the third or fourth lightest wood in the world. Density and cuts constitute the two main properties which can help you select and utilize the balsa in our daily life.
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