book

 

Learn English  
  Blue Level  
  Red Level  
  Yellow Level  
  Green Level  
  Purple Level  
  Orange Level  
  Violet Level  
  Video Lessons  
  Links  
  American Speech  
  Chat  
  How to Learn  
  Vocabulary  
  U.S. Citizenship  
  Reading  

 

 


 


filter  

 

 

A filter is a type of screen that allows liquids or air to pass through while trapping sold, unwanted substances:

  • An air filter removes dirt in the air as it goes through a machine.
  • A gas filter in your car traps impurities found in gasoline.
  • A coffee filter is used in a coffee maker. The filter allows water to pass through the coffee grounds.
  • I have to change the furnace filter in my house every few months because it gets dirty.
  • A vaccum cleaner has a filter that traps very small particles of dirt and dust.
  • Saltwater must go through a filtration process in order to separate the salt from the water. (The word "filtration" is also a noun.)

coffee filters These are coffee filters.

It's possible to use "filter" as a verb. In this case, it's in reference to the screening or selection of people or things.

  • Applicants for jobs are filtered through the interview process.
  • The media act as a filter for stories that are fake.
  • Football tryouts filter out the players who aren't good enough to make the team.
  • Immigrants who enter the United States are filtered though Homeland Security which checks people for criminal backgrounds.

Click here to learn more vocabulary.

 

 

Date of publication: December 8, 2016

 
 

 

 

© 2016 Learn American English Online. All rights reserved.