The average speed of helium at 25 degrees C is 1255 m/s. Convert this speed to miles per hour (mph).

Answer

To convert the speed from meters per second (m/s) to miles per hour (mph), we need to use conversion factors for both distance (meters to miles) and time (seconds to hours). First, convert meters to miles: 1 mile is approximately equal to 1609.34 meters. Second, convert seconds to hours: 1 hour consists of 3600 seconds (60 seconds per minute multiplied by 60 minutes per hour). The calculation is as follows: Speed in mph = (1255 m/s) * (1 mile / 1609.34 m) * (3600 s / 1 hour). Calculating the multiplication: (1255 * 3600) / 1609.34 = 4,518,000 / 1609.34 = 2807.36 mph. Rounding to an appropriate number of significant figures based on the input (1255 has 4 significant figures), the answer is 2807 mph.