At these conditions, the binary molecular diffusion coefficient of CO2 in air is 0.161 cm2 /s, but the effective diffusion coefficient of CO2 within the porous medium is only 0.011 cm2 /s. Fresh air containing no CO2 blows over the surface of the slab so that the convective mass transfer coefficient for CO2 (kc) is 0.0037 cm/s. Use the appropriate concentration-time chart to determine at what depth from the surface in the porous material the CO2 will be 3.0 mole% after a period of 30 minutes.

the tides are influenced by both the moon and the sun, it's easy to see that when the sun lines up with the moon and the earth, as during a new moon or full moon, the tidal effect is increased. these are known as spring tides, named not for the season, but for the fact that the water "springs" higher than normal. on the other hand, if the sun and the moon are 90 degrees apart in relation to an observer on earth as during the first quarter moon or third quarter moon, then high tides are not as high as they normally would be. this is because despite its greater distance, the sun's mass allows it to exert enough gravitational force on the oceans that it can negate some of the effects of the moon's pull. this phenomenon of lower high tides is called a neap tide. if you need more information on this topic visit moonconnection.com.

radioactive decay occurs in unstable atomic nuclei – that is, ones that don't have enough binding energy to hold

the nucleus together due to an excess of either protons or neutrons.

the solar system used to have much dust particles option no d