What does words such as aerobic aeronautics and aerosol help you know that aer means?

The words "aerobic," "aeronautics," and "aerosol" all share the root "aer" which comes from the Greek word "aēr" meaning "air". Here's how each word breaks down:

* Aerobic: "Aero" refers to air, and "bic" comes from the Greek word "bios" meaning "life." So, aerobic means "relating to or needing oxygen" which is present in air.

* Aeronautics: "Aero" again refers to air, and "nautics" relates to navigation or travel. So, aeronautics is the science or practice of flight in the air.

* Aerosol: "Aero" refers to air, and "sol" comes from the Latin word "solutio" meaning "solution." So, an aerosol is a suspension of fine solid particles or liquid droplets in air.

Therefore, the common root "aer" in all these words suggests that it means "air."