អង្គធាតុ
អង្គធាតុ គឺជាអ្វីៗដែលយើងអាចមើលឃើញផ្ទាល់នឹងភ្នែកទទេវាអាចជាវត្ថុរឹង,រាវ ឬឧស្ម័ន
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| Matter is usually classified into three classical states of matter, with plasma sometimes added as a fourth state for scientific purposes. From left to right: grains of refined sucrose (a solid), water (a liquid), depiction of particles in a gas, and a plasma globe (plasma). |