By subjecting water to immense pressure and directing it through a minuscule nozzle, it can effectively cut through the hardest materials, including rocks, metals, bulletproof glass, and even diamonds
Calculating Pressure: A Fire Hose Nozzle [...] Water pressure inside a hose nozzle can be less than atmospheric pressure due to the Bernoulli effect. Explain in terms of energy how the water can emerge from the nozzle against the opposing atmospheric pressure. [...] What is the pressure drop due to the Bernoulli Effect as water goes into a 3.00-cm-diameter nozzle from a 9.00-cm-diameter fire hose while carrying a flow of 40.0 L/s? (b) To what maximum height above the nozzle can this water rise? (The actual height will be significantly smaller due to air resistance.)