In late traditional society, family size and structural complexity varied directly with class.

For example, one of the theory's predictions is that within a society, law varies directly with relational distance.

He not only found the same mites, but also noted that their numbers varied directly with the percentage of carbon in his solutions.

Variable costs, such as implants, vary directly with the volume of cases performed.

In 1787 Charles showed that gas volume varies directly with temperature at constant pressure.

This measurement varies directly with the amount of substance that is present in the system.

For the community as a whole, total saving will tend to vary directly with the level of income.

In both countries, press attention varies directly with involvement in mainline politics.

A stepper's low speed torque will vary directly with current.

The pleasure of this climb will vary directly with one's physical condition.