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Most equations in physics are never true. All that can be done is to find more an more evidence in support of the equation. However, it is always possible that there is an as-yet-unknown factor which changes all the equations. this is what happened to Newtonian physics as a result of Einstein's work.

Q: What makes a valid physical equation true?

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Such an equation is called an IDENTITY.

you have to solve the actual equation in order to answer this about your variable

Solution

an solution

The LHS expression = RHS expression

Related questions

A number that makes an equation true is its solution.

Any number that makes an equation true is a 'solution of an equation'. it is a solution

A solution or root makes a true statement when substituted in an equation.

The solution set is the answers that make an equation true. So I would call it the solution.

Such an equation is called an IDENTITY.

It's the value that when substituted in for the variable, makes the equation true. Ex: x + 1 = 3 The value 2, when substituted for the variable x, makes the equation true.

The solution

solution

It's callled the "solution" of the equation.

That's the "solution" of the equation.

Such a value is said to be a solution, or a root, of the equation.

you have to solve the actual equation in order to answer this about your variable