Tetanus vaccine can help prevent tetanus disease, commonly known as lockjaw.. Tetanus is a serious disease that causes painful tightening of the muscles, usually all over the body. It can lead to locking of the jaw so the person cannot open his mouth or swallow. Tetanus leads to death in about one in ten cases.
The most abundant dissolved salt in ocean water is sodium chloride. It is a colorless crystalline compound with the chemical formula of NaCl.
(The PSU or practical salinity unit is incorrect, although frequently used.). 1  Salinity is approximately equal to the weight, in grams, of salt dissolved in 1000 g of seawater. 2  Average ocean water has a salinity of 35.0. 3  This means that 1000 g of average seawater contains 965 g of water and 35 g of salts.