Overview. Beryllium is the lightest member of the alkaline earth metals family. These metals make up Group 2 (IIA) of the periodic table. They include beryllium, magnesium, calcium, strontium, barium, and radium.Elements in the same column of the periodic table have similar chemical properties.eryllium is the lightest member of the alkaline earth metals family. These metals make up Group 2 (IIA) of the periodic table.
Definition 1: EER, energy efficiency ratio: Is the measure of air conditioner efficiency at maximum air conditioning load. It is measured by ratio of Btu/hour of cooling or heating load, to watts of electrical power input. The unit is in Btu hr-1 W-1. Definition 2: SEER, seasonal energy efficiency ratio: The measurement units of SEER is exactly the same as EER, but the difference lies in the data used for the measurement. Values for SEER, is determined through averaging readings of different air conditions, to represent air conditioner efficiency throughout the season.
DEFINITION of 'Internal Rate Of Return-IRR'. A metric used in capital budgeting measuring the profitability of potential investments. Internal rate of return is a discount rate that makes the net present value (NPV) of all cash flows from a particular project equal to zero.EFINITION of 'Internal Rate Of Return-IRR'. A metric used in capital budgeting measuring the profitability of potential investments. Internal rate of return is a discount rate that makes the net present value (NPV) of all cash flows from a particular project equal to zero.