Any one who could help me with my experment am in grad 11 prescribed experment 2

topic :investigation the relationship between the volume of a given mass of gas and the pressure exerted on it at constant temperature (verification of boyles law)

Selma made a diagram to compare convection and radiation. which label belongs in the area marked x? must involve temperature differences between substances or objects only occurs when molecules are in direct contact involves the movement of fluids based on density differences can occur where there is little or no matter