You are in trouble , if you have to ask.
Pi is a constant, wind speed is variable.
We usually write constants as numbers, for example, 13 or -4.22. However, some important constants may have unique symbols and names that are well known in science and mathematics, for example, (pi): It is a common constant in computing, engineering, and other disciplines. Since (Pi), is an infinite number with an exponential extension, it continues without a repeating pattern and without limits, so it is not possible to write it completely, and therefore it is represented by its sign or name. In theory, a variable number can be represented by anything other than a constant number. We usually write these variables with a single letter, and these letters can be chosen randomly, and they are simply complementary to the real value that the variable represents in computer programming. We usually write variables as expressions that indicate the purpose and goal of a variable (for example: a dollar bonus or the number of employees).
Constant is a specific fixed value. It does not change. But variable can take on or assigned different values, depending on the defined condition.
Important note: In some specific circumstances, a constant turns into a variable and we need to estimate its value.@
The general solution of the differential equation y'-y=0 is y=c.ex, where c is a constant, x is a variable and e is the Euler constant. We have already known the Euler constant e. x is the varible because the derivative of y with respect to x satisfies the equation. However, the derivative of y with respect to c does not satisfy the equation.
• Variable: Something that can change. Like your age, which gets bigger every year.
• Constant: Something that stays the same. Like the number of days in a week (always 7).
In other words :
• Variable: A container that can hold different things at different times.
• Constant: A container that holds one thing, and you're not allowed to change it.
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