Question

By which mechanism of heat transfer does heat travel in a straight line at the speed of light, allowing heat to travel through vacuums and air spaces?

Answer 1

Radiation is the  mechanism of heat transfer by which heat travel in a straight line at the speed of light, allowing heat to travel through vacuums and air spaces.

Radiation in physics is the emission or transmission of energy in the form of waves or particles through space or matter medium. This includes:

• Electromagnetic radiation such as radio waves, microwaves, infrared rays, visible light, ultraviolet rays, X-rays, and gamma rays (γ)
• Particle radiation beams such as alpha rays (α), beta rays (β), proton rays, and neutron rays (with static energy non-zero particles)
• Acoustic Radiation such as ultrasound, sound waves, seismic waves (due to physical transmission media)
• Gravitational radiation in the form of gravitational waves, or waves of curvature of space-time

Radiation is often classified as either ionizing or non-ionizing, depending on the energy of the particles it hits.

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