Thanks mjc123, for the opinion about of the potential dangers of using acetylene, it is really helpful. However, I am thinking about to get the gas from a cylinder because it seems the easier source, besides I don't need too much gas so that it is possible to request for a bit to one of the chemistry labs at my university. On the other hand, the pressure I want to apply is about 2 ATM, because the aim of doing all of this is to simulate the conditions in which some gases dissolve in mineral oils used as dielectric fluids in power transformers. This gas, among others, are generated and dissolved in the insulating oil, that is why the DGA analysis is used to diagnosticate the operative status of the transformer.