How to calculate the specific heat capacity?

q=cm△t。1. Definition: The ratio of the heat absorbed (or released) by a certain mass of a substance when the temperature rises (or decreases) and the product of its mass and the temperature that rises (or decreases) is called the specific heat capacity of the substance.

The specific heat capacity is expressed in c in joules (kilograms Celsius) and symbol: j (kg·?).

c) Representation. 2. Characteristics (1) The specific heat capacity is a characteristic of the substance, each substance has its own specific heat capacity, and the specific heat capacity of different substances is generally different, and the substance can be roughly identified. (2) The specific heat capacity only depends on the substance itself and its state, and has nothing to do with the mass, temperature, and heat absorption and release. (3) The larger the specific heat capacity of a substance, the less likely it is to change its temperature.

Specific heat capacity of water: C water = ?c)。Physical significance: When the temperature of water with a mass of 1kg increases or decreases1, the heat absorbed or released is.

Solution: The heat released by iron Q = C iron M iron (to iron - t) The heat absorbed by water Q absorption = C water M water (t - to water).

Q Suck = Q Release.

C water m water (t - to water) = c iron m iron (to iron - t) j kg 0

78kg×(t—10℃)=0

j/kg℃×0

2kg×(100℃—t）

3276×(t—10℃)=92×(100℃—t）3276t—32760℃=9200℃—92t3276t+92t=9200℃+32760℃3368t=41960℃t≈12

Give you a detailed answer, I hope it will help you! ）

If an object with mass m absorbs (or releases) heat δq in a certain process, and the temperature increases (or decreases) δt, then δq δt is called the heat capacity of the object in this process (referred to as heat capacity), which is represented by c, that is, c = δq δt. Divide the heat capacity by the mass to obtain the specific heat capacity c=c m=δq mδt. For the heat capacity and specific heat capacity of the micro process, there are c=dq dt, c=1 m*dq dt, respectively.

Therefore, in the finite process of the temperature change from t1 to t2, the heat absorbed (or released) q = (t2,t1)cdt = m (t2,t1)cdt.

In general, the heat capacity and specific heat capacity are both functions of temperature, but when the temperature variation range is not too large, they can be approximated as constants. So there is q=c(t2-t1)=mc(t2-t1). If the temperature change is δt=t2-t1, then q=cmδt.

This is the basic formula for calculating heat in secondary schools using specific heat capacity.

The formula for calculating the specific heat capacity is shown in the figure below:Q absorbs cm (t-to) q puts cm (to-t).

c denotes the specific heat capacity.

m denotes the mass of the object.

to indicates the initial temperature of the object.

t denotes the final temperature of the object.

t: The temperature of the object changes, i.e., t-t0).

Using the concept of specific heat capacity, it is possible to deduce a molar heat capacity that represents the amount of heat required to raise 1 k of a mol of substance.

1. Effect on air temperature.

According to Xinhua News Agency, after the impoundment of the Three Gorges Reservoir, the world's largest artificial lake will become a natural "Bihui air conditioner", making the climate of the mountain city of Chongqing warm in winter and cool in summer. It is estimated that the temperature may drop in the summer5 and in the winter3 to 4.

2. Application of water cooling system.

People have long started to use water to cool the heat-generating machine, and in the computer CPU heat dissipation, the heat sink can be used to contact the CPU core, so that the heat generated by the CPU is transferred to the heat sink through heat conduction, and then the fan is used to take away the heat dissipated into the air.

Specific heat capacity. is a physical quantity that represents the thermal properties of a substance. It is usually denoted by the symbol c.

If an object with mass m absorbs (or emits out) heat in a certain process, and the temperature increases (or decreases) δt, then δq δt is called the heat capacity of the object in this process.

Referred to as heat capacity), it is denoted by c, that is, c = δq δt. Divide the heat capacity by the mass to obtain the specific heat capacity c=c m=δq mδt. For the heat capacity and specific heat capacity of the lifting and destruction of the micro process, there are c=dq dt, c=1 m*dq dt, respectively.

Therefore, in the finite process of the temperature change from t1 to t2, the heat absorbed (or released) q = (t2,t1)cdt = m (t2,t1)cdt. In general, the heat capacity and specific heat capacity are both functions of temperature, but when the temperature variation range is not too large, they can be approximated as constants. So there is q=c(t2-t1)=mc(t2-t1).

If the temperature change is δt=t2-t1, then q=cmδt. This is the basic formula for calculating heat in secondary schools using specific heat capacity. The formula for calculating the amount of heat associated with specific heat.

q=cmδt, i.e., q absorbs (releases) = cm(t-t1) where c is the specific heat, m is the mass, t is the final temperature, t1 is the initial temperature, and q is the energy. When it is endothermic, it is Q=cmδt liter (the actual raised temperature is used to reduce the initial temperature of the object), and when it is exothermic, it is Q=cmδt (the actual initial temperature is used to reduce the temperature after the drop). Or q=cmδt=cm (end of t - beginning of t), q>0 is endothermic and q<0 is exothermic.

Specific heat capacity of the mixture: weighted average.

Calculation: c= c m=(m1c1+m2c2+m3c3+....)m1+m2+m3+…The specific heat capacity of a gas is defined: cp

The heat capacity when the pressure is unchanged and the temperature changes with the volume, cp=dh dt, h is the enthalpy. cv

The heat capacity when the volume is unchanged and the temperature changes with the pressure, CV=du dt, and U is the internal energy. When the temperature of the gas is t and the pressure is p, the specific heat capacity of the gas when the heat dq is provided: cp*m*dt=cv*m*dt+pdv; where dt is the temperature change and dv is the volume change.

Specific heat capacity: For those with f degrees of freedom.

of gases. And the molar specific heat capacity is: cv,m=r*f2 cv=rs*f2 r= Meyer's formula:

cp=cv+r specific heat capacity ratio: =cp cv multi-party specific heat capacity: cn=cv-r (n-1)=cv*( n) (1-n) For both solid and liquid, the specific heat capacity cp can be measured by the specific constant pressure heat capacity, i.e.:

C=cp (measured with a defined method for c=dq mdt). Dulong-Petit Rule:

There is a simple rule that all metals have a fixed one within a certain temperature range.

cp 25j (mol·k) so cp=25 m, where m is the molar mass.

Specific heat capacity unit j (mol·k). Hopefully, thank you.

There is a formula for Zhiwu He: q=cm t

Q refers to the heat absorbed (or released).

c refers to the specific heat capacity, m refers to the mass, and t refers to the temperature at which the substance changes (i.e., the temperature that rises or decreases), then c = q m t

In other words, the specific heat capacity can be calculated by substituting the data into this formula on the premise of knowing the amount of heat, mass, and temperature change absorbed (or released).

Q absorbs cm (t-to) q puts cm (to-t).

The formula for calculating the specific heat capacity is generally Q suction = cm (t-to) q discharge = cm (to-t). c denotes the specific heat capacity. m denotes the mass of the object.

to indicates the initial temperature of the object. t denotes the final temperature of the object. （△t：

The temperature of the object changes, i.e., t-t0).

Relationship between specific heat capacity and temperature: There is no direct relationship between specific heat capacity and temperature. Because the specific heat capacity is the physical property of the substance, it does not change with any change and does not change with the temperature For a substance, the specific heat capacity is used to measure its ability to absorb heat or release heat, and is only related to the structure of the substance itself.

Difference between specific heat capacity and calorific value:

Calorific value, also known as calorie value or calorific value. In fuel chemistry, it is an important indicator of fuel quality. The amount of heat emitted by a unit mass (or volume) of fuel when it is completely combusted. It is usually measured with a calorimeter (calorimeter) or calculated from the results of a fuel analysis.

Specific heat capacity refers to the amount of heat required to increase the temperature of a certain amount of homogeneous substance by 1k in the absence of phase change and chemical change. If it is a 1mol substance, the required heat is the molar heat capacity. The molar heat capacity cp under isobaric conditions is called the constant pressure molar heat capacity.

The molar heat capacity CV under isochoric conditions is called the constant volume molar heat capacity. The relationship between the constant pressure molar heat capacity and temperature is usually correlated as a polynomial. <>

The formula for calculating the specific heat capacity is Q suction = cm (t-to) q discharge = cm (to-t).

The formula for calculating the specific heat capacity is generally Q suction = cm (t-to) Q discharge = cm (to-t). Biguan c denotes the specific heat capacity. n denotes the mass of the object.

to indicates the initial temperature of the object. t denotes the final temperature of the object. （△t：

The temperature of the object changes, i.e., t-t0).

Specific heat capacity, also known as specific heat capacity, referred to as specific heat, is the heat capacity of a unit mass substance, that is, the internal energy absorbed or released by a unit mass containing a wise omen object when changing the unit temperature, usually represented by the symbol C, the specific heat capacity of the substance is related to the process carried out, and there are three kinds commonly used in engineering applications: constant pressure specific heat capacity cd, constant volume specific heat capacity cp and saturated state specific heat capacity.

Relation between specific heat capacity and temperature:

Specific heat capacity is not directly related to temperature. Because the specific heat capacity is the physical property of the substance, which does not change with any change or temperature, for a certain substance, the specific heat capacity is used to measure its ability to absorb or release heat, and is only related to the structure of the substance itself.