Text 1 Heisenberg's Uncertainty Principle is a fundamental limit in quantum mechanics. It states that certain pairs of physical properties, like position and momentum, cannot both be known to arbitrary precision. The more precisely you know one, the less precisely you know the other. Text 2 This is not a measurement error or a limitation of our tools. It is an intrinsic property of wavelike systems. Because particles have wave nature, they do not have a defined position and momentum simultaneously in the way classical objects do.