Concepts

An ph test with a strip submerged in water.

A thermometer with a low, or cold, tempurature.

A thermometer with a medium, or cool, tempurature.

An arm with the hand pointing out, the distance from elbow to fingertip is about eighteen inches.

A hand with the fingers together and thumb out. The distance between the fingers is two to three inches.

An arm extended out long. The distance from shoulder to fingertip is about twenty four inches.

A hand with the thumb and pointer finger extended, the distance between the two fingers is about six inches.

A hand with a finger pointing, the distance from knuckle to fingertip is about one inch.

Two hands positioned palm to fingertip. The length of the two hands is about twelve inches.