A portion of a medium-weight concrete masonry unit was tested for absorption and moisture content and produced the following results: mass of unit as received = 5435 gsaturated mass of unit = 5776 goven-dry mass of unit = 5091 gimmersed mass of unit = 2973 gCalculate the absorption in kg/m3  and the moisture content of the unit as a percent of total absorption. Does the absorption meet the ASTM C90 requirement for absorption?

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Hydrogen Energy

Energy is a quantity that cannot be defined, its existence can only be felt. In simple language, if a system possesses energy, it can do a specific kind of work. There are many forms of energy sources which people can use to obtain work. Solar energy, tidal energy, hydroelectric energy, geothermal energy, wind energy are some of the renewable energy sources which are primarily used for the production of electricity.