"Resistance decreases with temperature". How to interpret this sentence?

Solution 1:

It is a perfectly good sentence. With temperature is understood as as temperature increases.

Edit: two people have chosen to downvote this answer, without giving any reason. I guess it's because I didn't provide any sources to back up my answer.

In the iWeb corpus, there are 237 instances of "increases with temperature" and 61 of "decreases with temperature". On inspection, nearly all of these are like the given example, having no further specification. Here are some examples from the corpus:

While we know that evaporation increases with temperature...

This electrical resistance in metals increases with temperature

With thermistors, resistance decreases with temperature and with RTD's, resistance increases.

Air density also decreases with temperature. Warm air is less dense than cold air... (this example confirms my interpretation)

Bed expansion increases with flow rate and decreases with temperature.