BEHAVIOUR OF GASES
A Coggle Diagram about PRESSURE
(Pressure difference in liquids and gases depends on density
, Pressure is force per unit area
, The same force applied over a large area creates a lower pressure
, In gases and liquids at rest, the pressure at any pont acts equally in all directions
, In gases and liquids, the pressure increases with depth
and Units: Pascals
(Density is mass per unit volume
, The density of an object depends on what it's made of
, The average density of an object determines wheather it floats or sinks
, A solid object will float on a fluid if it has a lower density than the fluid
and Units; g/cm, kg/cm
), STATES OF MATTER
), CHANGING STATES
- When you heat a liquid, the heat energy make the particles move faster. Eventually, when enouhg of the particles have enough energy to overcome their attraction to each other, big bubbles of gas form in the liquid - this is boiling
- When you heat a solid, heat energy makes the particles vibrate faster until the forces between them are overcome and particales start to move around - this is melting
- Evaporation is when particles escape from a liquid to become gas particles
), PARTICLE THEORY
(KE is directly proportional to temperater
, Particle theory says that gases consist of very small particles which are constantly moving in completely random directions. The particle do no take up much space so most of the gas is empty space.
and The particles constantly collide with each other and with the walls of their container.
), ABSOLUTE ZERO
(When cooling a substance down, you reduce the KE of the particles.
, The coldest anything can get is -273 C. This temperature is known as absolute zero
and Absolute zero is the start of the Kelvin scale of temperature
), BROWNIAN MOTION
(In 1827, Robert Brown noticed that pollen grains in water moved in a zigzag, random motion.
and Brownian motion supports the particle theory
) and GAS LAWS