上浒充通大率 SHANGHAI JIAO TONG UNIVERSITY 10.1 Average velocity of gas molecules momentum mvx Consider the x direction first Surface area=A -mv Here F is the average △I=Vx△t force during△t Fat=A,At号(2m或)9 PV =nNami =nRT P m晚 RT NAm m晚= T=7 R10.1 Average velocity of gas molecules mvx -mvx 𝐹∆𝑡 = 𝐴𝑣 𝑥∆𝑡 𝑛𝑡 𝑉 2𝑚𝑣 𝑥 ( 1 2 ) F Δl=vxΔt Surface area= A 𝑃 = 𝐹 𝐴 = 𝑚𝑣 𝑥 2 𝑛𝑡 𝑉 𝑅𝑇 = 𝑁𝐴𝑚𝑣 𝑥 2 momentum Consider the x direction first