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IGCSE Physics Section 4(a) - 4(c)
Pressure, Simple Kinetic Molecular Model of Matter, Thermal Properties
5
Physics
06/22/2017

Term
 Pressure   [image]
Definition
 - Defined as: Force per unit area - p = F/A - Unit = N/m2 or Pa (Pascal)                    [image]
Term
 1. Pressure & Temperature of a gas     2. Pressure & Volume of a gas
Definition
 1. If the temperature of a gas is increased, the average velocity of the molecules is increased, which increases momentum. Hence, the molecules will collide with the walls of the container more often and with greater force. This causes the pressure to increase.   2. If the volume of a gas is decreased, while maintaining a constant temperature, the molecules will be squashed together and will collide more often with the walls of the container. Hence, the pressure will increase - pressure and volume have an inverse relationship.
Term
 1. Thermal capacity   2. Specific heat capacity   3. Specific latent heat
Definition
 1. The ability of an object to store heat energy. - Calculated by the amount of heat energy needed to raise the temperature of an object by 1oC Thermal capacity = mc   2. The amount of heat energy needed to raise 1kg of a material by 1oC. c = E/mΔT   3. The amount of heat required to change the state of 1kg of a substance, without changing its temperature. E = mL
Term
 Evaporation   [image]
Definition
 - Occurs when fast moving molecules escape the attractive intermolecular forces of the liquid, and become a gas - The temperature of a liquid determines the average kinetic energy of its molecules - Has a cooling effect - The rate of evaporation is affected by surface area, temperature and wind
Term
 The pressure & volume of a gas have an:    a) Infinite relationship b) Approximately proportional relationship c) Inverse relationship d) Hourly meeting
Definition
 Answer: c)   The pressure and volume of a gas have an inverse relationship - if the volume of a gas is decreased (while maintaining a constant temperature), the pressure will increase.
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