The sodium ion may be abbreviated as Na+ or as simply Na. Sodium can occur as a salt in a crystalline solid. Sodium chloride (NaCl), sodium phosphate (Na2HPO4) and sodium bicarbonate (NaHCO3) are commonly occurring salts. These salts can be dissolved in water or in juices of various foods.
A Reference Point is something you use to determine the position of an object, but the reference point has to be something that doesn't move at all. For Example: A Tree. A Reference Point is something you use to determine the position of an object, but the reference point has to be something that doesn't move at all. For Example: A Tree.
dew point the temperature at which moisture in the atmosphere is deposited as dew. far point the most remote point at which an object is clearly seen when the eye is at rest. point of fixation. 1. the point or object on which one's sight is fixed and through which the axis opticus passes. 2. the point on the retina, usually the fovea, on which are focused the rays coming from an object directly regarded.