Hardness means a rock is hard as a scale from 1 to 10; 1 softest and 10 hardess. Best Products for Testing Water Hardness Water hardness refers to the level of dissolved mineral content in water. 2  Though most experts agree that hard water in the home is not generally harmful to the health, it canâ¦. 3  The Five Major Parts of the Brain At its most basic, the brain controls the body.
A katana is a type of sword that originated in the Muromachi Period  (1392-1573) in Japan. Although the Katana is classified as the  single edged blade used by the Samurai, â¦ it actually can refer to  any single edged blade.  Katana sword is also known as samurai sword and this sword was  originated at Japan.These were traditionally made using forging  process. It is a curved, slender, single-edged blade with circular  or squared tsuba. Katana sword is also known as samurai sword and this sword was  originated at Japan. These were traditionally made using forging  process. It is a curved, slender, single-edged blade with circular  or squared tsuba.
A naginata consists of a wooden pole with a curved single-edged blade on the end; it is similar to the Chinese guan dao or the European glaive. Similar to the katana, naginata often have a round handguard (tsuba) between the blade and shaft, when mounted in a koshirae. naginata consists of a wooden pole with a curved single-edged blade on the end; it is similar to the Chinese guan dao or the European glaive. Similar to the katana, naginata often have a round handguard (tsuba) between the blade and shaft, when mounted in a koshirae.