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 salt content of water is given as parts per thousand (ppt), i.e. the amount of salt (g) dissolved in 1,000 g of water. Common salt (sodium chloride) is the main dissolved solid in seawater, and the average salinity is 35 ppt.he salt content of water is given as parts per thousand (ppt), i.e. the amount of salt (g) dissolved in 1,000 g of water. Common salt (sodium chloride) is the main dissolved solid in seawater, and the average salinity is 35 ppt.