How quickly do the magnetic poles switch sides

5. how can you decrease the pressure of a gas in a container without changing the volume of the gas?

There are 6.022 x 10^23 atoms of hg in 1 mole of hg. the number of atoms in 4.5 moles of hg can be found by multiplying 4.5 by 6.022 x 10^23 a. 2.7 x 10^24 b. 27 x 10^23 c. 2.71 x10^24 d. 27.099 x 10^23

Which type of stress results when two plates push against one another? a. compression b. tension c. force d. shear