In real life, there is something called "heavy water". This is an isotope of H2O. Because of this, it is slightly radioactive. In all water, it has 1 ppm, but CAN be separated. It should be introduced as a new element, HWTR. When you boil it, it creates neutrons, heat, pressure, and HWRV (Heavy water vapor). If mixed with water, it would become WATR. And, if mixed HWRV is mixed with WTRV becomes WTRV. There are many possibilities with this, and one example is stronger nuclear bombs. For example, you add a small dot of Wi-Fi. Then you take a bit of HWTR and surround it with with E-Wall. Then, past that, you add RBDM. Then DUET. Then a layer of C4 to keep it held in place. If the E-Wall is powered, the HWTR hit the RBDM and explodes, creating heat, pressure, and NEUTRONS, which react with DUET to explode, and the DUET self-destructs, and the C4 explodes, releasing all the energy. This could be a great idea to add into Powder Toy.

@randalserrano

I got the idea from DUET. Except this is a liquid, and it reacts with heat, not neutrons.