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Heat and temperature. Concepts and relationship

09/04/2026

The online heat and temperature simulations on this page allow us to delve deeper into these two important scientific concepts. We will discover what heat is, what temperature is, and what the relationship between heat and temperature is.

Concepts of heat and temperature

Heat and temperature are two related but different concepts. Understanding these concepts is important to many fields of science and engineering, including climatology, physics of matter and thermal engineering.

What is temperature

Temperature is a measure of the average kinetic energy of particles in a system, while heat is the transfer of thermal energy between two systems at different temperatures. The instrument for measuring temperature is called a thermometer and the units of measurement are degree Celsius (°C), degree Fahrenheit (°F) and degree Kelvin (°K).

What is heat

Heat is the transfer of thermal energy from one system to another. Heat transfer can occur by convection, conduction or radiation. Specific heat is the amount of heat required to raise the temperature of a material by one unit of temperature. The amount of heat transferred between two systems depends on the temperature difference between them and the amount of mass and specific heat of the systems.

Relationship between heat and temperature

Heat is not the same as temperature. The temperature of a system is directly related to the heat energy it contains, but temperature is not the only factor to consider. For example, two systems can have the same temperature, but if they have different masses or specific heat, the amount of heat required to raise their temperature will be different.

Explore the exciting STEM world with our free, online, simulations and accompanying companion courses! With them you’ll be able to experience and learn hands-on. Take this opportunity to immerse yourself in virtual experiences while advancing your education – awaken your scientific curiosity and discover all that the STEM world has to offer!

Heat and temperature simulations

Specific heat


Specific heat is the amount of thermal energy required to raise the temperature of one gram of a substance by one degree Celsius (°C) or one kelvin (K). It is expressed in J/(g-°C) or J/(kg-K) and varies according to the material, since it depends on its capacity to store thermal energy. See in this animation what happens when the same amount of heat is applied to two products with small and large specific heat respectively.






Heat capacity


Heat capacity is the amount of heat that a body or substance needs to absorb or release to change its temperature by 1 degree Celsius (°C) or 1 kelvin (K). It differs from specific heat in that heat capacity refers to the whole object, whereas specific heat is an intrinsic property of the material and is measured per unit mass. Observe in this animation what happens when applying the same amount of heat to two bodies with small and large heat capacity respectively.






Thermometer


A thermometer is a measuring instrument used to determine the temperature of a body, an environment or a substance. It works by means of different principles such as volume variation with temperature or electrical resistance or thermal radiation. This simulation shows the principle of operation of a mercury or alcohol thermometer, based on the expansion of a liquid inside a glass tube.






Heat conduction


Heat conduction is the process by which thermal energy is transferred through a material without visible movement of matter. It occurs when molecules in a hot region vibrate and transfer energy to neighboring cooler molecules, spreading heat from a higher temperature zone to a lower temperature zone. This type of heat transfer is most efficient in solids, especially metals. In this simulation you can see what happens as you move the cold zone closer to the hotter one.






Heat convection


Heat convection is the process of heat energy transfer through the movement of a fluid (liquid or gas). It is due to temperature differences within the fluid, which generates density variations and causes the displacement of hot material towards cold areas and vice versa.
In this simulation you can see what happens when heating an area and how heat is transferred by convection.






Heat transfer


Energy Forms and Changes


Explore how cooling or heating iron, brick, water, and olive oil increases or decreases energy. See how energy is transferred between objects. Build your own system, with sources, changes, and uses of energy. Track and visualize how energy flows and changes through your system.
Licencia de Creative Commons

Heat and cold


Order the objects from coldest to hottest, which one is at room temperature?

Temperature Scales


Conversion between degrees Celsius, Fahrenheit and Kelvin. What is the lowest temperature that can be reached in degrees Celsius?

Calibration of a thermometer


Steps to calibrate a thermometer in degrees Celsius using the phase changes of water.

Heat transfer


Energy Forms and Changes


Explore how cooling or heating iron, brick, water, and olive oil increases or decreases energy. See how energy is transferred between objects. Build your own system, with sources, changes, and uses of energy. Track and visualize how energy flows and changes through your system.
Licencia de Creative Commons

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Heat is a form of energy that is transferred between bodies when there is a temperature difference, always flowing from the hotter object to the colder one, while temperature is a physical quantity that measures the thermal state of a body, that is, the level of energy and motion of its particles, so they should not be confused, since heat refers to energy in transfer and temperature describes the condition of a system at a given moment.
Heat is transferred between objects through three main mechanisms that explain most thermal phenomena: conduction, which occurs through direct contact between particles, especially in solids; convection, which takes place through the movement of fluids such as liquids and gases that carry energy; and radiation, which involves the emission of energy in the form of electromagnetic waves and does not require a material medium, as in the case of heat coming from the Sun.
When two objects are at different temperatures, heat naturally flows from the hotter one to the colder one because particles with higher energy transfer part of that energy to those with lower energy, and this process continues until both reach the same temperature, at which point thermal equilibrium is achieved and no further heat transfer occurs.
This happens because not all materials respond in the same way when they receive energy, since the temperature change depends on both the mass and the type of substance, meaning that some materials require more energy to heat up while others require less, which explains why, under the same conditions, some objects warm up faster than others.
Not always, because in some situations the heat absorbed by a body is not used to increase its temperature but to change its state, such as from solid to liquid or from liquid to gas, so during this process the temperature can remain constant even though the system continues to absorb energy.

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