Affect as a verb means "to influence."
The temperature affects the growth rate ofthe bacterial sample.Affect as a noun has a specialized meaning in medicine andpsychology, referring to moods and feeling as distinct fromthoughts or knowledge.
Dua (1989) constructed the Thoughts and Real-LifeExperience Scale (THARL) to assess the degree of positive andnegative affect experienced by people as a resultof their thoughts and day-to-day interactions.
--J. K. Dua, "The Role of Negative Affect and Positive Affectin Stress, Depression, Self-Esteem, Assertiveness, Type ABehaviors, Psychological Health, and Physical Health," GenetPsychological Monographs
Effect as a verb means "to bring about, to produce," orto "accomplish something."
The temperature reversal effected a majorslowdown in the bacterial growth rate.Effect as a noun means "result."
Increased bacterial growth rate was one majoreffect of the rise in pond temperature.Impact as a verb means "strike with a blow" or "to packfirmly together."
The wisdom tooth impacted the molar.Impact as a noun means "a collision."
The constant impact of the two gearmechanisms on each other eventually produced metal fatigue inseveral sprockets.
Do not use impact as a verb in place of "to affect."
The temperature impacts the growth rate ofthe bacterial sample.
The temperature affects the growth rate ofthe bacterial sample.
Do not use impact as a noun in place of "effect."
The release of hydrocarbons has had a significantimpact on the depth of the ozone layer.
The release of hydrocarbons has had a significanteffect on the depth of the ozone layer.
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