This physics problem tests your understanding of fundamental physical laws and their applications. The step-by-step solution below breaks down the problem using relevant equations and physical reasoning.

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21. (a) Tofauti kati ya mwali unaotoa mwanga (luminous flame) na mwali wa Bunsen (Bunsen flame): Mwali unaotoa mwanga (luminous flame) ni njano, hutoa masizi, na si moto sana kwa sababu ya ukosefu wa hewa ya kutosha kwa mwako kamili. Mwali wa Bunsen (Bunsen flame) ni bluu, safi, na moto zaidi kwa sababu ya hewa ya kutosha kwa mwako kamili.
21. (b) Aina moja ya mwali unaotumika katika kulehemu (welding): Mwali wa oksijeni-asetilini (Oxy-acetylene flame).
22. Kwa kuwa siwezi kuchora, nitaeleza nafasi za miunganisho kwenye silinda ya kuhifadhia maji moto wima:
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21. (a) Tofauti kati ya mwali unaotoa mwanga (luminous flame) na mwali wa Bunsen (Bunsen flame): Mwali unaotoa mwanga (luminous flame) ni njano, hutoa masizi, na si moto sana kwa sababu ya ukosefu wa hewa ya kutosha kwa mwako kamili.
This physics problem tests your understanding of fundamental physical laws and their applications. The step-by-step solution below breaks down the problem using relevant equations and physical reasoning.