>>13677158>>13677171Pressure is measured as an amount of force per unit area, and the actual source of this force is fluid particles constantly hitting anything suspended in that fluid, with each little particle impact causing the particle to bounce back but also causing whatever was hit to experience an equal and opposite impact. The force conferred to a unit of area embodies what pressure actually is: the total net force of a series of impacts conferred from the particles of a fluid to a unit area of whatever is suspended in that fluid.
Temperature is measured as its own macroscopic quantity but is basically the amount of energy associated with particle movements that aren't in bulk motion, just with the energy adjusted as a proportion of the material's heat capacity. It's important to note here that temperature doesn't exist at any single point since it's due to the motion of multiple particles, so when we say that something has a particular temperature at a particular point, it's an energy measurement of particles NEAR that point.
To put it another way, pressure is associated with how hard & often fluid particles hit things, and temperature is associated with how much total particle speed is contained near a point in a material. That's to say, they're both associated with kinetic energy.
Now,
>expand the containerYou get the same amount of particles available to hit the sides of a larger container, ergo less impacts per unit area, so less pressure. You also get the same amount of particle kinetic energy contained in a larger space, ergo less particles are moving near any point you select, ergo less temperature.
>add more fluidYou get more particles available to hit the sides of the container, ergo more impacts per unit area, ergo more pressure. You also get the kinetic energy associated with those fluid particles added to the energy associated with the particles in the container, ergo more particles moving near any point you select, ergo more temperature.
