As the molecules go faster, they are more likely to bump straight out of the liquid and fly off to become a gas. The more molecules that bump out, the higher the vapor pressure. Now, if those molecules have big intermolecular forces like hydrogen bonding or london dispersion forces - when they bump into each other they're more likely to stick.
One of the most common causes of yellow nails is a fungal infection. As the infection worsens, the nail bed may retract, and nails may thicken, crumble, lack a cuticle and detach from the nail bed in places. Yellow nail syndrome is often a sign of respiratory disease, such as chronic bronchitis. Yellow nail syndrome can also be related to swelling of the hands (lymphedema). In rare cases, yellow nails can indicate a more serious condition such as severe thyroid disease, lung disease, diabetes or psoriasis.
Electrolytes or something along that line that opens up your cell membrane allows better assimilating of vitamins and minerals. However, even though my moons are coming back, my fingernalis are still very brittle. Bottom line, I do think how your fingernails look is a good indicator of things going awry in your body. Sbilek