一、类比液体的压强引入课题大气压强与液体的压强都是压强概念的外延,都具有压强概念所反映的共同的本质属性,可以用类比法教学。大气和液体都是受重力作用的流体,液体内部有压强,大气中有压强吗?液体压强可用 P=ρgh 计算,大气压强呢?等等。在联系旧课的基础上引入新课、探索大气压强及其规律,过渡自然,顺应学生求知心理的发展。 First, the introduction of analog liquid pressure The subject atmospheric pressure and liquid pressure are extensions of the concept of pressure, both have the common essential attributes reflected in the concept of pressure, can be used analogy teaching. Both the atmosphere and the liquid are fluids that are subject to gravity. There is pressure inside the liquid. Is there pressure in the atmosphere? The pressure of the liquid can be calculated using P=ρgh, atmospheric pressure, etc. Introduce new lessons on the basis of old lessons, explore atmospheric pressure and its laws, transition nature, and follow the development of students’ intellectual psychology.