Physics - Sound - Speed of sound - Speed of Sound

A 4-step lesson. Step 1: 'Speed of sound in air at 20°C ≈ 343 m/s (often rounded to 340 m/s). This is about 1 km every 3 seconds. Much slower than light (3×10⁸ m/s - about 1 million times faster!)' Step 2: 'Speed depends on the medium: Gases (slowest): Air 340, Helium 972, CO₂ 259. Liquids: Water 15