Matter

Matter is any substance that occupies space; gases, liquids, solids, electrons, atoms,molecules, etc., all fit this definition.

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Why first angle and third angle projection method is used in machine design and why second and fourth angle method is not used?

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In second angle, both top and front view are drawn above the x-line whereas in fourth angle its vice versa. In second and fourth angle method, top view and front view overlaps. hence we never use those methods. In first angle method, front view lies above the x-line and top view lies below. vice versa for third angle. As both the views lies on either side of x-line in first & third angle, we make use of these methods. (Abdul Karim)
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