The boiling point is the temperature at which the vapor press of the liquid is equal to the atmospheric press. As altitude changes, the pressure changes. As altitude increases the pressure decreases. We can't get the water hot enough to break down the molecules in the potatoes. There is a relationship between attractive forces and boiling point.
High viscosity indicates high attractive forces.
Surface tension is the energy required to increase the surface area of a liquid by a unit amount. . Surface particles are different from internal particles with respect to attractive forces. On the surface the a.f. are not balanced, there is a net pull inward. The surface molecules are pulled into a skin or surrounding drop. There is a tendency for the surface area of a liquid to be reduced as much as possible.