When you hum, your throat isn’t contracted as much as it is to support open mouthed singing. You are able to pitch better humming than singing. This is because of your support muscles… diamond of support… starting from your central pelvic bone, along to your hip bones and up to your diaphragm. When you hum, you engage these muscles naturally, thats how you’ve learnt to support yourself. However, we speak all the time and become lazy, when we talk or sing you do not engage these muscles causing ourselves harm and also the inability to reach our full potential range. Now, by engaging these muscles (essentially pelvic flaw) the throat is supported and held in place causing the vowels or words you produce to be stronger and therefore more supported to extend your upper and lower range.
Source: singing teacher
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