Looking at the The Flash clip again , I get what they are going for stylistically , i . e . the cold gun isn ' t a random invention but directly related to taking out Barry ' s speed . I would keep the part about cooling things means slowing down molecules . But throwing in ominous statements about absolute zero feels silly and like they are trying too hard to sound smart using junior high science terms . The Gotham example is using a little more complicated level of science , so feels more intelligent . The ammo not only affect the function of the gun , eg . liquid helium would be 60 deg colder than liquid nitrogen and therefore more potent , but also plays into the plot where they have to find helium stores to catch Freeze . Anyways , I enjoy both series for what they are .