heat transfer

Hot coffee is stirred with a spoon, the spoon gets hot due to

• Convection

• Conduction

• Radiation

Near the ceiling of a room the air is warmer. The warm air rises because of

• Convection

• Conduction

• Radiation

In a swimming pool, the water near the surface is slightly warmer. The warm water rises because of

• Convection

• Conduction

• Radiation

In heat transfer, heat always flows from the _______________ substance to the _______________ substance.

• Hotter to colder
• Colder to hotter
• Hotter to hotter
• Colder to colder

The type of heat transfer that happens through direct contact of molecules or particles with each other is ___________________.

• Convection
• Conduction
• Radiation
• insulation.