Filter

High school (ages 12+)
Science & Technology

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/filter

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the primary separation principle?Size exclusion based on pore size relative to particle size
2. What is the historical significance?Used since antiquity for water purification and beverage clarification
3. What is a filter and how does it work?A filter is a special kind of sieve that lets liquid or gas pass through but keeps solid particles from going through. It works by having tiny holes that are smaller than the particles we want to keep out.
4. Why do we use filters in water and food?Filters help clean water and food by catching dirt, germs, and other bad stuff. This makes the drinks and meals safe to drink and eat.

Physical Process: A change or separation that does not alter the chemical composition of a substance.
Pore Size: The diameter of the openings within a filter medium, determining what can pass through.
Fouling: The undesirable accumulation of material on the surface of a filter, reducing its performance.