the si unit of length is the meter which is defined as the length equal to
Metre The metre (British spelling) or meter (American spelling) (from the Greek noun μέτρον, "measure") is the base unit of length in the International System of Units (SI). The SI unit symbol is m.[1] The metre is defined as the length of the path travelled by light in a vacuum in 1/299 792 458 seconds.[2]
Bar (unit) The bar is defined using the SI derived unit, pascal: 7005100000000000000♠1 bar ≡ 100,000 Pa ≡ 100,000 N/m2.
Color Electromagnetic radiation is characterized by its wavelength (or frequency) and its intensity. When the wavelength is within the visible spectrum (the range of wavelengths humans can perceive, approximately from 390 nm to 700 nm), it is known as "visible light".
Momentum In SI units, it is measured in kilogram meters per second (kg · m/s). Newton's second law of motion states that a body's rate of change in momentum is equal to the net force acting on it.