It varies, between species, from 1.4 to 2.9
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A [real] constant.
C.
what is the unit of Stefan constant
Ah, the weight of a standard 2x4 can vary depending on the type of wood and its moisture content. On average, a 2x4 made of pine can weigh around 1.5-3 pounds per foot. Remember, each piece of wood is unique, just like a happy little tree, so it's always best to check the specific weight for the type of wood you're using.
Generally, constant names are case sensitive in PHP.But... you can do a trick. If you will be consistent and all constant name will be defines as uppercase, you can access them using a combination of constant() and strtoupper() functions. Look at this example:?phpdefine(MY_CONSTANT, "HELLO");echo constant(strtoupper(my_constant));echo "";echo constant(strtoupper(My_Constant));echo "";echo constant(strtoupper(my_CONSTANT));?>