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Ushma ki vidhi dvara sabse teji se sanchit hoti hai – "Vahan" (Conduction) ke tulna mein:

Vastu mein ushma sanchay ki teevrata (speed) in vidhi ke anusar hoti hai:

1. Vikiran (Radiation) – Sabse teji se ushma sanchit hoti hai.

2. Sancharan (Convection) – Madhyam gati se hoti hai.

3. Chalan (Conduction) – Sabse dheere hoti hai.

Isliye: "Vikiran" dvara ushma sabse teji se sanchit hoti hai. Yeh prakriya vacuum (shoonya) mein bhi hoti hai jaise surya ki garmi prithvi tak pahunchti hai.