The presence of water in a body increases its electrical conductivity.

Prepare for your Marine Engineering Exam with our engaging and informative quiz. Test your knowledge with multiple-choice questions, detailed explanations, and hints. Set sail towards success!

Moisture increases electrical conductivity because water provides a medium in which ions can move. In a dry solid, charge carriers are largely bound within the lattice, so the material behaves like an insulator. When water is present, especially water containing dissolved minerals, it forms an electrolyte. The dissolved ions—such as sodium, chloride, calcium, and others—move under an applied electric field and carry charge, greatly enhancing conduction. Pure water conducts only very weakly, but natural or mineral-rich water has many ions, so the conductivity rises significantly. Temperature also plays a role, since higher temperatures increase ion mobility and thus conductivity.

So, the statement is true: the presence of water increases conductivity. The degree of increase depends on how much dissolved minerals are in the water, but water itself is the enabling factor for conduction.