Which simple engineering control technique can be used to reducing dust generation ? Mack is a construction worker . He has to cut various parts . To reduce the dust generating while machining he can use water or a on the cutting machine's blades

Ahe-xe mixture containing a 0.75 mole fraction of helium is used for cooling electronics in an avionics application. at a temperature of 300 k and atmospheric pressure, calculate the mass fraction of helium and the mass density, molar concentration and molecular weight of the mixture. if the cooling capacity is 10 l, what is the mass of the coolant?