alveoli

so in my textbook it says, 'intrapleural pressure is more negative in the apex of the lung than in the base'. Now cos the alveoli in the apex is larger, there's less space in the intrapleural space, and therefore the pressure within the intrapleural space increases or 'more negative'? From...

I had a question on pulmonary collapse and surfactants I know that surfactants reduce the surface tension of the alveoli fluid because by adding the surfactant the hydrophilic molecules are able to move away underneath this surfactant if we apply a force and therefore they aren't that resistant...