Conversely, generation length has changed little and remains in the low 20s in less developed nations. An intergenerational rift in the nuclear family, between the parents and two or more of their children, is one of several possible dynamics of a dysfunctional family.
For mineral, see Quartz. The quart is a unit of volume (for either the imperial or United States customary units) equal to a quarter of a gallon (hence the name quart), two pints, or four cups. Since gallons of various sizes have historically been in use, quarts of various sizes have also existed; see gallon for further discussion.
A pint is equal to 2 cups (example: a large glass of milk!) 1 pint = 2 cups = 16 fluid ounces. When measuring many cups of liquid all put together we might want to use quarts. A quart (qt) is the same thing as 4 cups or 2 pints. 1 quart = 2 pints = 4 cups = 32 fluid ounces. If we still need more liquid we can switch to using gallons. A gallon (gal) is the same as 16 cups or 8 pints or 4 quarts. It is the largest liquid measurement.