Do not bring it to boiling point quickly. If the quantity of rice can be carried into the center of rice if cooked over medium heat. When it begins to boil, turn heat to high and cook for 1 min. Never lift lid while cooking. Since the lid might bounce from the pressure of the stream, it is better to place a weight, or some dishes on the lid.
Rice absorbs enough water.
Then the pot begins to steam. Reduce heat to the lowest for 10 min. Every grain of rice absorbs water and become plump. It is liable to burn, so cook over the lowest heat. Turn off the heat and let rice stand, covered for 10 min.