For number 3 the answer is solid: pizza
liquid: smoothie
gas: air diffuser
Conduction:
The handle of a pot becoming too hot to grab as it cooks on the stove.
Grabbing a warm coffee mug to warm your hands.
Putting an ice pack on an injury.
Burning yourself by touching boiling water.
Convection:
An oven that cooks by cycling warm air through the bottom and out the top.
Warm water rising to the surface of the ocean and cooler water sinking.
Cooking popcorn using a microwave.
Radiation:
Heat from a fire warming your hands.
Warm air rising off of the pavement.
Heat from the sun hitting a solar panel.
Hope this helps ☝️☝☝
Density is mass over volume: d=m/v
d = 393/50 => d = 7.86 g/ml
