Seawater typically has a salinity of around 35 g/kg, although lower values are typical near coasts where rivers enter the ocean. Rivers and lakes can have a wide range of salinities, from less than 0.01 g/kg to a few g/kg, although there are many places where higher salinities are found.onceptually the salinity is the quantity of dissolved salt content of the water. Salts are compounds like sodium chloride, magnesium sulfate, potassium nitrate, and sodium bicarbonate which dissolve into ions.
Palatal Expansion. Palatal expansion is a combination of tooth movement and jaw expansion. It works by widening the two halves of the upper jaw, called the palate. The two halves are joined together by a 'suture' in the middle of the roof of the mouth.
Make sure that a string of floss is attached on the key so it doesnât go down the patientâs throat. Hold the key with two fingers. Place the wire (Key) into the front hole of the rapid palatal expander and then rotate it to the back of the mouth until it stops. Pull the key out towards the back of the mouth.