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.
Often, spoon nails are a sign of iron deficiency anemia or a liver condition known as hemochromatosis, in which your body absorbs too much iron from the food you eat. Spoon nails can also be associated with heart disease and hypothyroidism.
Similar to other nail abnormalities, Beau's lines can also signal a mineral deficiency. Beau's lines usually appear in all fingernails, but if the condition affects only a single nail, it may be a sign that a cyst or wart exists at the base of the nail causing pressure. It is important for those with unexplained fingernail conditions to visit a doctor or dermatologist a proper diagnosis. Treatments vary according to a doctor's analysis.