Orale vowels are vowels that use only the mouth as resonance body. You can test that by keeping your nose closed with your fingers and pronouce iiiiiiiiiiiiii, ooooooooooo, uuuuuuuuuuu etc. It doesen't make any difference whether you keep your nose close or not. The problem is, that there are no nasale vowels in English, therefore for some people the difference is not obvious. However you can try the same thing with oral consonants. Keep you nose closed with your fingers and say s, s, s, s or d, d, d, d. These are orale consonants and it doesn't make any difference whether you keep your nose open or not. Than try mmmmmmmmm and nnnnnnnnn. This a nasale consonants and in this case there is a big difference. A single m or n is still possible, because for a very short time you can park air in your nose. (Otherwise you were not able to speak if you had a cold.) However mmmmmmmmmm or nnnnnnnnnnn is not possible.
Obviously it is not completely impossible to pronounce orale vowels with the nose closed, but they sound different. Nasale vowels uses the mouth as a resonance body as well, but they use the nose as well. If it were completely impossible to produce nasale vowels, the French and Portuguese would fall silent in case of a wave of influenza, what is not the case, but the sounds sound different.Whether the aire escapes completely through the mouth or completely through the nose or trough both of them depends on the position of the soft palate. (That's the little corner you see at the background of your mouth.) The m and the n are an exception. In this case it is the tongue that prevents the air from escaping through the mouth. Normally we are not aware that we can interrupt and open the connection between the mouth and nose with the soft palate, but it is obvious that we can do it, because otherwise we wouldn't be able to pronounce a t as in tea or d as in drink. We produce the t and the d by stowing the air in the mouth and let is escape suddenly. That wouldn't possible if the air could escape through the mouth and therefore it is clear that soft palate can interrupt the connection.
|[ɐ]||à||á||(a preposition + a article|
|[e]||ê||você||(polite form singular) you|
|[ɘ]||e||de||of / from|
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