Hello, I've discovered yesterday that there exists such things as electrets, which are some kind of electrical analogues of magnets. Apparently only few compounds can be turned into electrets. You can of course easily make and electro-electret with an exterior electric field and liquid water for example. We could imagine an experiment with a bottle of water and a capacitor. If you put the bottle of water between the capacitor plates, the water would become polarized. I don't think I'm utterly wrong until here. There is however a question I cannot easily answer. What would happen if I decided to freeze the water with an electric field still active ? I don't think this would keep the water polarized, transforming it into an electret. However, I cannot explain this last claim. What happens when it freezes ? A second question, which is not really related to the particular experiment I described above : is there an easy way to make an electret ? Thank you !