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function dm=mymfun(z,m)

R=0.00008314;
T=298.15;
N=1.326963e6;
H=1.230375;
C=0.0156;
P=(1+0.00001*994*9.8*z);%±í´ïʽ¿´Ç壬×Ô¼ºÌî²¹

r=(3*m*R*T/(4*pi*P))^1.5;

if r<7e-4
    Vb=4474*r^1.357;
else
    Vb=0.23;
end

if r<6.67*-4
    Kl=0.6*r;
else
    Kl=4e-4;
end


dm=-Kl*(H*P-C)*4*pi*r^2*N/Vb;
%%%%%%%%%%%%%%%%%%
°ÑÉÏÃæµÄ±£´æÔÚÒ»¸ömÎļþÖÐÈ»ºóÔÙÔËÐÐÏÂÃæµÄ´úÂë
[z,m]=ode45(@mymfun,22:-0.5:0,0.22019232);

plot(z,m);
grid on
xlabel('z');
ylabel('m');
title('z-m');
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