Plasma cutting is a process that cuts through electrically conductive materials by means of an accelerated jet of hot plasma. Plasma – a fourth state of matter which is ionized gas, it occurs when gas is heated at a very high temperature (20,000 deg. Cent.) And achieve equal number of positively charged ions and negatively charged ions. So under plasma cutting machine the gas is of high temperature and pressure. Thus it can only be used on high temperature and pressure.