Physics p, 2 + 3
Source 1-http://www.bbc.co.uk/schools/gcsebitesize/science/ocr_gateway/home_energy/heating_housesrev3.shtml
The specific latent heat of a substance is a measure of how much heat energy is needed to melt or boil it. It is the energy needed to melt or boil 1 kg of the substance.
Different substances have different specific latent heats. The specific latent heat of a given substance is different for boiling than it is for melting. The table shows some examples.
Latent heats of substances substance specific latent heat of melting kJ/kg specific latent heat of boiling kJ/kg water 334
2260
lead
22.4
855 oxygen 13.9
213
The specific heat capacity of a substance is a measure of how much heat energy it can hold. It is the energy needed to increase the temperature of 1 kg of the substance by 1 ºC. Different substances have different specific heat capacities.
Heat capacity of substances substance specific heat capacity J/kg/ºC water 4181 lead 128 oxygen 918
Source 2- http://www.le.ac.uk/se/centres/sci/selfstudy/particle02.html
In a solid the strong attractions between the particles hold them tightly packed together. Even though they are vibrating this is not enough to disrupt the structure. When a solid is heated the particles gain energy and start to vibrate faster and faster. Initially the structure is gradually weakened which has the effect of expanding the solid. Further heating provides more energy until the particles start to break free of the structure. Although the particles are still loosely connected they are able to move around. At this point the solid is melting to form a liquid. The particles in the liquid are the same as in the solid but they have more energy. To melt a solid energy is required to overcome the attractions between the particles and allow them to pull them apart. The energy is provided when the solid is heated up. The temperature at which something melts is called its "melting point" or melting temperature. At room
The specific latent heat of a substance is a measure of how much heat energy is needed to melt or boil it. It is the energy needed to melt or boil 1 kg of the substance.
Different substances have different specific latent heats. The specific latent heat of a given substance is different for boiling than it is for melting. The table shows some examples.
Latent heats of substances substance specific latent heat of melting kJ/kg specific latent heat of boiling kJ/kg water 334
2260
lead
22.4
855 oxygen 13.9
213
The specific heat capacity of a substance is a measure of how much heat energy it can hold. It is the energy needed to increase the temperature of 1 kg of the substance by 1 ºC. Different substances have different specific heat capacities.
Heat capacity of substances substance specific heat capacity J/kg/ºC water 4181 lead 128 oxygen 918
Source 2- http://www.le.ac.uk/se/centres/sci/selfstudy/particle02.html
In a solid the strong attractions between the particles hold them tightly packed together. Even though they are vibrating this is not enough to disrupt the structure. When a solid is heated the particles gain energy and start to vibrate faster and faster. Initially the structure is gradually weakened which has the effect of expanding the solid. Further heating provides more energy until the particles start to break free of the structure. Although the particles are still loosely connected they are able to move around. At this point the solid is melting to form a liquid. The particles in the liquid are the same as in the solid but they have more energy. To melt a solid energy is required to overcome the attractions between the particles and allow them to pull them apart. The energy is provided when the solid is heated up. The temperature at which something melts is called its "melting point" or melting temperature. At room