# What is the speed of sound in air at 21 C?

## What is the speed of sound in air at 21 C?

344 m/s
At sea level, at a temperature of 21 degrees Celsius (70 degrees Fahrenheit) and under normal atmospheric conditions, the speed of sound is 344 m/s (1238 km/h or 770 mph).

What is the speed of sound in 35 degrees Celsius?

Question: What is the speed of sound at 35°C? (352 m/s)What is the speed of sound at -20°C? (319 m/s)A 320 Hz tuning fork will produce a wave of what wavelength in air at 22°C? (1.1 m)We see a bolt of lightning and 4 seconds later we hear the thunder.

### How fast does sound travel if the air temperature is 20 degrees Celsius?

At 20 °C (68 °F), the speed of sound in air is about 343 metres per second (1,235 km/h; 1,125 ft/s; 767 mph; 667 kn), or a kilometre in 2.9 s or a mile in 4.7 s.

How is the speed of sound related to temperature?

NASA says: The speed of sound is dependent on the temperature of the air. It varies with altitude (height) only because of the changing temperature! The atmospheric pressure is proportional to the density of air.

## What is the speed of sound in still air?

The speed of sound in still air at 0 degrees Celsius is 331.3 m/s. It depends on the temperature, and the material. Since sound is more easily transmitted between close molecules, it travels faster in the denser substance. Thus the speed of sound increases with the stiffness of

What is the formula for the speed of sound in air?

Speed of sound in air. Air is almost an ideal gas. The formula for the speed of sound in ideal gases is: c = √(γ * R * T / M) where: c – the speed of sound in an ideal gas. R – the molar gas constant, approximately 8.314,5 J · mol −1 · K −1.

### What is the speed of sound at sea level?

Here is the answer of Google : “Speed of sound at sea level = 340.29 m/s”. and the given atmospheric pressure “at sea level” makes really no sense. In SI units with dry air at 20°C (68°F), the speed of sound c is 343 meters per second (m/s).