How to Measure Liquid Density: Hydrometer, Pycnometer, Equal-Arm & Mohr Balance Explained

0:26 1. method (hydrometer) 1:13 2. method (pycnometer) 3:19 3. method (equal-arm balance) 5:52 4. method (Mohr balance) What’s the best way to measure the density of an unknown liquid? In this video, you’ll learn four laboratory methods used in physics and chemistry to determine liquid density accurately. We demonstrate how to measure density using a hydrometer, a pycnometer, an equal-arm balance, and a Mohr balance, step-by-step. Whether you’re a student, teacher, or science enthusiast, this practical experiment will help you understand when and why to use each technique — from simple classroom measurements to more precise laboratory work. By the end of the video, you’ll clearly understand multiple ways to determine liquid density and how to apply them correctly. Perfect for: • Physics students • Lab beginners • Science teachers • Anyone preparing for exams • Anyone interested in how measurement really works • And many others Don’t forget to LIKE, COMMENT, and SUBSCRIBE for more videos! 📢 © 2026 Peter Les. This video and its script are original works protected by copyright law. Any unauthorized reproduction or use is prohibited. Keywords: measure liquid density, how to measure density of a liquid, hydrometer experiment, pycnometer method, Mohr balance experiment, equal arm balance physics, density of ethanol, density of water at 24°C, laboratory density measurement, physics lab experiment, chemistry lab techniques, Archimedes principle experiment, measurement uncertainty in physics