Apressure of 3 atm was required to force water through an initially dry teflon membrane of uniform pore size. determine the pore size. (theta_water = 110 degree, gamma_water = 73mn/m)

Explanation:

As it is given that = 3 atm =

                r = 73 mN/m

            =

As it is known that free energy of a wetting liquid in a solid-liquid interface is lower than the solid-gas interface free energy.

As a result, there will be spontaneous filling of pores but we need a non-reactive gas under the pressure so that the liquid can be forced out of the pores.

The pressure difference will be represented as . Hence, work done by the gas to increase interface free energy is as follows.

where,   = incremental volume of gas in the pore

                   dS = incremental solid-gas interface area due to .

So,             =

Therefore, formula to calculate pore size is as follows.

                       D =

Putting the given values into the above formula as follows.

                        D =

                            =

                             =

Thus, we can conclude that pore size is .                                                

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.

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