You have the factory standing behind the certified pre-owned car, plus you'll be buying a car that the original manufacturer has inspected to ensure that it is worthy of certification. The only downside to certified pre-owned cars is that they are generally more expensive than other used cars.ot all used cars can qualify for certified pre-owned programs, and terms vary from one brand to the next, but any true certified pre-owned program will include at least a 100-point inspection of the car. If problems are found, the factory-trained technicians will fix it or disqualify the car from the program.
hydrogen is flammable yes, but not very. because it is the least dense element it disperses very quickly meaning if it were to leak out of something it would disperse before it could ignite. It also burns very fast and has a higher ignition temperature than gasoline (gasoline is between 228 and 500, hydrogen is 550).
Ammonia gas is easily compressed and forms a clear, colorless liquid under pressure. It is usually shipped as a compressed liquid in steel cylinders. Ammonia is not highly flammable, but containers of ammonia may explode when exposed to high heat. How is ammonia used? About 80% of the ammonia produced in industry is used in agriculture as fertilizer.