Heat can be transformed by 3 mechanisms.
1. Conduction ( in solids )
2. Convection ( in fluids , either liquid or gas )
3. Radiation ( in gases)
When food is covered by aluminium foil , the air next to the food is trapped there.
Because of this , heat is reflected back to the food by the foil than dissipating heat to surroundings . Thus , it keeps the food warm.
1. Conduction ( in solids )
2. Convection ( in fluids , either liquid or gas )
3. Radiation ( in gases)
When food is covered by aluminium foil , the air next to the food is trapped there.
Because of this , heat is reflected back to the food by the foil than dissipating heat to surroundings . Thus , it keeps the food warm.
