5.1 - Thermal Physics Flashcards Preview

OCR Physics A Level > 5.1 - Thermal Physics > Flashcards

Flashcards in 5.1 - Thermal Physics Deck (18):
1

What is an Absolute or Thermodynamic Scale of Temperature?

A scale independent of the properties of any specific substance. Measured in Kelvin.

2

What is Absolute Zero?

0K, the temperature at which a substance has minimum internal energy

3

What is 0k in degrees Celsius?

-273(.16)

4

What is a Thermal Equilibrium?

When two objects in contact are at the same temperature, meaning there is no net heat flow between them

5

What is Internal Energy?

The sum of the randomly distributed kinetic and potential energies of all the atoms or molecules within a system

6

What is Brownian Motion?

The random movement of small visible particles suspended in a fluid due to collisions with much smaller, randomly moving atoms or molecules of the fluid

7

What is the Specific Heat Capacity of a substance?

The amount of energy needed to raise the temperature of 1kg of the substance by 1K

8

What is the Specific Latent Heat of Fusion of a substance?

The amount of energy required to change the phase of 1kg of a substance from solid to liquid

9

What is the Specific Latent Heat of Vaporisation of a substance?

The amount of energy required to change the phase of 1kg of a substance from a liquid to a gas

10

What is a Mole?

The amount of substance that contains exactly as many particles as exactly 12.0g of carbon-12

11

What is Avogadros Constant?

The number of particles in a mole

12

What is the value of the Avogadro Constant?

6.02x10^23

13

What is an Ideal Gas?

A gas that has internal energy only in the form of random kinetic energy

14

What is the Mean Square Speed?

The mean value of the Square of velocity for a large number of gas particles moving randomly in a gas

15

What is Boyle's Law?

The volume of a fixed mass of gas is inversely proportional to the pressure exerted on the gas, under the conditions of constant temperature

16

What is the Boltzmann Constant?

A constant used when relating the temperature of the gas to the mean translational kinetic energy of the particles in the gas

17

What is the Kinetic Model of Matter?

All the matter is made. Il of very small particles which are in constant motion. The model allows us to explain the properties of matter and changes of phase in terms of the arrangement of the particles, the motion of the particles and the attractive forces between them

18

What is the relationship between Avogadros Number, the number of moles and the number of particles?

N=nNa

Number of particles = moles x avogadros