how to solve for the density of air? can anyone explain why the answer is =0.00191 slug/ft^3?

What is the pressure of the gas in the cylinder, in kPa (kiloPascal)? h = 0.620 m, Pmercury = 13,600 kg/m3, 1.0 atm = 1.00 x 105 Pa = 100 kPa, and g = 10.0 m/s?. Your answer needs to have 3 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement. Mercury. p = 13,600 kg/m² Pen

A cube 7.81 cm on each side is made of a metal alloy. After you drill a cylindrical hole 1.62 cm in diameter all the way through and perpendicular to one face, you find that the cube has a mass of 0.56 kg. What is the density of this metal? Use π=3.14 . Express your answers in kgm3 and in whole numbers (NOT SCIENTIFIC NOTATION).

An airplane passenger has a volume V1 of air in his stomach just before the plane takes off from a sea-level airport. a. What volume will this quantity of air have at cruising altitude at the same temperature (body temperature), in terms of V1, the pressure on the ground P1, and the cabin pressure at cruising altitude P2?  b. What is this volume, in cubic centimeters, if the initial volume is 95 cm3 and the cabin pressure drops to 7.50 × 104 Pa when the plane is at cruising altitude?

What is the approximate mass of the air in our 10 m × 12 m × 4 m physics lab? The density of air is 1000 g/cm3. Convert density to kg/m^3

An auditorium measures 35.0 m x 25.0 m x 5.0 m. The density of air is 1.20 kg/m3. (a) What is the volume of the room in cubic feet? 154524.28 ft3 (b) What is the weight of air in the room in pounds? 48234.375

Estimate the average blood pressure in a person’s foot if the foot is 1.03 m below the aorta, where is the average blood pressure is 101 mmHg. For the purposes of this estimate, assume the blood isn’t flowing. The density of blood is 1060 kg/m^3. Give your answer in units of mmHg.