“We expected that they fly around each other and they never have physical contact,” Hristov said. “We have found, shocking to us, that bats crash into each other quite often. It’s a messy situation, but generally it’s very safe and it works very well.”
Source
This implies a ideal gas law for bats, an ideal bat law, bat liquid, bat solid, and bat plasma
Cricket might know a thing or two about the bat law