Air is a colorless, odorless and transparent gas.

Compared with wood water, air has many different characteristics and some of the same characteristics.

Scientific inquiry goal

Further study the characteristics of air by sensory comparison.

Some characteristics of air can be observed and described.

Scientific attitude goal

Realize that you can study the unknown in the way you have learned.

Scientific, technical, social and environmental goals

Air is closely related to people's lives.

Teaching reflection: This class requires students to make a preliminary observation and description of a bag of air by using the methods they have learned before, so as to develop their understanding of gas. The first-year students are no strangers to the word "air". Air is closely related to life, and students know that air can support breathing. Guide them to describe the characteristics of air and tell how they observe these characteristics. For example, "Observing the air with eyes is transparent and colorless, just like water", "Compared with water, you can see that water is flowing. When the bag was opened, the air ran away.