Hi, there is a parameter sigma which should be equal to 5.67*10**(-8) in my programming. When the code is like this

**sigma= 5.67*10**(-8)**

L=0.1 !m

a=1.0

e=1.0

ua=2000.0 !K

dx=L/21.0

t=sigma*dx*(a*ua**4-e*298.0**4)

print*, t

the results is t=0.00000000

However, when the code is like this

**sigma= 0.0000000567**

L=0.1 !m

a=1.0

e=1.0

ua=2000.0 !K

dx=L/21.0

t=sigma*dx*(a*ua**4-e*298.0**4)

print*, t

I get the exact result that t=4317.871

I don't know why I got two different results because of the sigma function. Could you tell me why?