VIDEO: Q = mc * delta t
If a certain substance is to be heated, a certain amount of heat must be added to it. Since substances absorb heat differently, this amount can be calculated using the formula Q = mc * delta t.
The amount of heat Q = mc * delta t
- The formula Q = mc * delta t indicates the amount of heat required to heat a substance to a certain temperature. You need the individual values of the formula - such as m, which stands for mass - in order to be able to calculate the value.
- It should be noted that substances have a certain mass (m). This is usually given. This can be liters (for liquids) or grams (for gases or solids).
- The heat capacity c is fixed for each substance. For example, water has a heat capacity of 4.19. If you have a task at school, these values are usually given.
- The temperature difference delta t is the value by which the substance should be heated. The higher the value, the higher the temperature difference and the more heat has to be added to the fabric.
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Calculation with Q = mc * delta t
- If the values mentioned above are known, they only have to be entered accordingly in the formula Q = mc * delta t in order to obtain the amount of heat Q.
- One task could be, for example: How much heat do you need to heat a liter of water from 20 degrees to 80 degrees. To do this, you must first calculate the difference in temperature before you enter the remaining values in the formula.
- Since delta t is 60 and water has a heat capacity of 4.19, the formula is Q = 1 l * 4.19 * 60. An amount of heat Q of 251.4 J (joules) is therefore required.
