In a hiring freeze, an employer decides to stop hiring employees for all non-essential positions. It allows an employer to consolidate current employees and potentially restructure departments to complete the work that is essential for serving the customers of the business.
Since the electrical conductivity is a measure to the capacity of water to conduct electrical current, it is directly related to the concentration of salts dissolved in water, and therefore to the Total Dissolved Solids (TDS). Salts dissolve into positively charged ions and negatively charged ions, which conduct electricity.
Resistivity versus Conductivity. When the ionic concentration is very low (such as in high purity water), the measured conductivity falls below a value of one micro Siemens per centimeter. In order to express these numbers as whole numbers as opposed to fractions, the resistivity scale is often used.