Scientific Constants

noun a situation or state of affairs that does not change

adjective occurring continuously over a period of time

• The speed of light is a constant in physics.
• She's always talking about her constant need for caffeine.
• My best friend is my constant, we do everything together.
• Change is the only constant in life.

adjective not capable of being changed or altered; permanent

• The laws of physics dictate that certain principles are unalterable.
• No matter how much you try, some things are just unchangeable.
• You can't mess with the unalterable facts.
• Her love for him was as unalterable as the stars in the sky.