Proportionality and disproportionality

When two objects, X and Y, are considered in relation to each other, the variability of certain of their features or characteristics can be compared. The comparison may produce either a proportional or a disproportional result. You can use the following sentence structures:

A feature ofX

changes

(inversely)

with

(a change in)

a feature of Y

varies

as

(a variation in)

according to

in accordance with

is

proportional to

As

a feature ofX

changes,

so does

a feature of Y

varies,

so

+ verb

The (better)

the (better)

Example sentences:

The higher the velocity of steam, the greater the turbine speed.

Data input rise and fall times reduce as driver output impedance increases.

The critical twist value, after which strength decreases, is lower for the former, but increases with increasing yarn linear density, which is the reverse of the effect found for conventional yarns.

During expansion, the pressure varies inversely to the volume.

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