How to distinguish between calorific value and specific heat capacity? The difference between calori

Question 1: Calorific value, because this is talking about the heat released by the combustion of two different fuels, not the heat released (absorbed) by the temperature rise (fall).

The calorific value is the amount of heat emitted when 1kg of a substance is burned.

Specific heat capacity is the amount of heat absorbed or emitted by a rise or fall in the temperature of a substance1.

Question 2: D, the question does not say that the two fuels are of the same mass. So A can't be chosen. BC is wrong at first glance. If you don't understand, you can ask.

1.Specific heat capacity: The amount of heat required per unit mass of a substance to raise the unit temperature, c represents the heat capacity. Unit: kg (kg· ) The calorie is calculated as e=cm t

Calorific value: 1 kilogram (per cubic meter) of the heat emitted by the complete combustion of a certain solid (gaseous) fuel is called the calorific value of the fuel, Calorific value, also known as card value or calorific value, in J kg

It can be seen from above"Liquefied gas takes less time"That is, "less natural gas is used to boil a pot of water", that is, the title means that the fuel gas used to boil a kettle of water m is reduced, and the calorific value is only related to the quality and conforms to the title (as seen from the unit J kg).

A, C are all wrong in A, B did not say how much was burned, maybe A burned 1 ton, B only burned the fault in the different materials, the heat released is also different, maybe A is wood, B is atomic energy, hydrogen bomb energy (this can be nuclear**).

Calorific value: The heat released by the complete combustion of one kilogram of fuel is called the calorific value Q=mq VQ specific heat capacity: the heat released by a substance rising (decreasing) by 1 degree Celsius c=qm T selection da does not indicate the quality of the fuel.

b The calorific value of the fuel is not stated.

c Because this question has nothing to do with the specific heat capacity.

So if you don't understand it, you can ask.

The calorific value is generally marked with the words "fuel combustion";

Specific heat capacity is the words "how much heat is absorbed (released)".

This is the easiest way to distinguish, respectfully

<> properties are different: calorific value, also known as calorific value or calorific value, refers to the ratio of the heat released by the complete combustion of a certain fuel to its mass, which is a specific property of a substance.

Specific heat capacity, abbreviated as specific heat, also known as specific heat capacity, is a physical quantity commonly used in thermodynamics, indicating the ability of an object to absorb heat or dissipate heat.

The unit is different: calorific value: 1 kilogram per cubic meter of heat emitted by the complete combustion of a certain solid or gaseous fuel is called the calorific value of the fuel, which belongs to the characteristics of the substance, the symbol is q, and the unit is joules per kilogram.

The specific heat capacity is measured in the SI system of units in joules per kilogram of Kelvin, which is the energy required to raise the temperature of 1 kilogram of a substance by 1 Kelvin.

Conversions are different:

The calorific value reflects the combustion characteristics of fuels, that is, the ability of different fuels to convert chemical energy into internal energy during combustion.

The greater the specific heat capacity, the greater the ability of the object to absorb heat or dissipate heat. It refers to the amount of heat absorbed or emitted by a unit of temperature per unit mass of a substance rising or falling per unit of temperature.

First, the nature is different.

1. Calorific value: It is the heat emitted when the fuel per unit mass (or volume) is completely combusted.

2. Specific heat capacity: refers to the amount of heat required to increase the temperature of a certain amount of homogeneous substance by 1k when there is no phase change and chemical change.

Second, the calculation formula is different.

1. Calorific value: the calculation of the heat released by the complete combustion of solid or liquid fuels, the formula: q discharge=mq The calculation formula of the heat released by the complete combustion of gaseous fuels:

Q=VQ Q is the heat (J), Q is the calorific value (J kg), M is the mass of the solid fuel (kg), and V is the volume of the gaseous fuel (m3).

q=qput m(solid); q=q discharge v (gas); w=qm=q m w=qv=q v (w: total work).

2. Specific heat capacity:

The greater the specific heat capacity of a substance, the more heat energy is required for the same mass and temperature rise. For example, the specific heat capacities of water and oil are about 4200 j (kg·k) and 2000 j (kg·k), respectively, that is, the heat energy of heating water of the same mass is about twice as high as that of oil. If the same mass of water and oil are heated separately with the same heat energy, the temperature rise of the oil will be greater than that of water.