Yami pours powdered cocoa mix into milk and stirs it. Then she microwaves the mixture for three minutes. When she takes the cup out, the handle is very warm. Steam rises from the cup, so she blows it before taking a sip. In which part of this scenario can convection be best observed?
stirring powdered cocoa mix into milk
touching the warm handle of the cup
rising steam from the cup of cocoa
pouring the cocoa mix into the milk