A mole of iron is therefore 55.845 grams. Quick conversion of 1 cubic foot to liters gives us 28.32 liters. Going back we can take this number to find that 28.32 liters of gas at STP is going to be 1.26414494 moles of air. Great, we can now determine how many moles of each particular substance we have from the percentage composition of air.
X-rays are attenuated as they pass through matter. That is, the intensity of an X-ray beam decreases the farther it penetrates into matter. Basically, each interaction of an X-ray photon with an atom of the material removes an X-ray from the beam, decreasing its intensity.
+ Intensity level for an average person, defined here as 70 kg or 154 lbs. The activity intensity levels portrayed in this cha rt are most applicable. to men aged 30 to 50 years and women aged 20 to 40 years. Intens ity is a subjective classification. For example, what is vigorous intensity for a. moderately fit individual might be moderate intensity for a highly fit individual.