Difference between Be absent from something and Be absent in something

be absent from something—(of people) be not present at a place:

• He is never absent from work without an excuse.

Note: The expression is not equivalent in meaning to the phrase absent oneself from something—stay away from an event, etc.;

avoid something:

• I absented myself from the conversation at the next decent opportunity.

be absent in something—(of things) be missing in smth.:

• The impulsive type of noise (ignition interference and static) is generally absent in radar.