(named for French chemist Charles-Augustin de Coulomb (1736-1806), who devised a method of measuring electrical quantity)
2. An instrument that measures the quantity of electricity in coulombs by integrating a stored charge in a circuit which has very high input impedance.
3. A device for determining the amount of a substance released during electrolysis by measuring the electrical charge that results from the electrolysis.
Coulometers can be used to detect and to measure trace amounts of substances such as water.
Some independent property must be observed to establish the equivalence point in the reaction.
2. The electrostatic force of attraction exerted by one charged particle onto another charged particle of the opposite sign.
3. The tendency of bodies to draw together when carrying opposite charges of electricity.
If the charges are of the same sign, then the force is repulsive; if they are of opposite signs, the force is attractive.
The strength of the force is described by Coulomb's law or a law that was formulated by Charles Augustin de Coulomb (1736-1806), French physicist, which describes the electric forces between charged objects.
The law states that:
- like charges repel each other and unlike charges attract each other,
- the attraction or repulsion acts along the line between the two charges,
- the size of the force varies inversely as the square of the distance between the two charges,
- the size of the force is proportional to the value of each charge.
3. A force on a charged particle resulting from an electrostatic field, equal to the electric field vector times the charge of the particle.
4. Like charges in close proximity produce forces of repulsion between them; consequently, if two surfaces bear appreciable and approximately equal densities of charged groups on their surfaces appreciable forces of repulsion may occur between them.
The range of these forces is determined primarily by the ionic strength of the intervening medium, forces being of minimal range at high ionic strength.
The forces are effective over approximately twice the double layer of their thickness.
It includes the forces between two charged particles; such as, between electrons and protons, that according to Coulomb's law is proportional to the product of the charges and inversely proportional to the square of the distance between them and which is either repulsive or attractive, to each other depending on the relationship of the charges.