so I saw this post (x) and I was like, wait a second, Barry’s lighting that gas on fire by moving his fingers? How fast is Barry moving?

If you look closely, there’s a label that says that the gas is propane, which has a molar mass of 44.10 g/mol, a specific heat of 1.67 J/g*K, and autoignites at 743 K. So, Barry has to be moving, at the minimum, fast enough to reach 743 K.

So, let’s say he’s igniting 1 mole of propane (there’s really no way to measure the mass by watching) and that the room temperature is a standard 298 K. With Q=mcΔt, we have:

Q = (44.10 g)(1.67 J/g*K)(743 K - 298 K)

Q = 32772.915 J or 32772.915 kg*m^2*s^-2

Then, we have the total thermal energy from Barry’s two fingers moving! So, to find the velocity, I used 1/2mv^2=Q. For the mass of a human finger, I used 100 g since that was the first result from google. I use 1/2mv^2 twice, one for each finger’s movement:

½(0.1 kg)v^2 + ½(0.1 kg)v^2 = 32772.915 kg*m^2*s^-2

(0.1 kg)v^2 = 32772.915 kg*m^2*s^-2

v^2 = 327729.15 m^2*s^-2

v= 572.4763313885 m/s

Then, I converted the velocity to miles per hour:

572.4763313885 m/s * 60 s/min * 60 min/hour * 0.000621371 mile/m = 1280.5926858403 miles per hour

Barry snapped his fingers at, at the least, **1280 miles per hour** or **Mach 1.68**. To put that into perspective, he had to run straight for 5.3 miles in season 1 to reach Mach 1.1 so he could supersonic punch Tony Woodward.

That’s one fast snap.