# How can i calculate the exact amount of heat absorbed by a black paint?

In summary, the conversation discusses how to determine the temperature rise for a specific color, such as black, based on the LRV, heat source, and other relevant details. It is suggested that the heat absorption coefficient can be used to calculate this, but the speaker is unable to find this information for black color. The use of absorptivity is also mentioned as a potential method for determining heat absorption.

## Homework Statement

Hi.
Knowing the LRV, heat source and all other relevant details, how can we deduce the exact temp rise with black colour (or any other colour for that matter)??

## The Attempt at a Solution

i think just like we do for metals, if we know the heat absorption coefficient, then it can be done.
But unfortunately i can't find anything named "heat absorption coefficient" for black colour.
Is there any equivalent?

Well usually with a given paint color you can find out the absorptivity $\alpha$ which will show how much heat it will absorb. I would assume that it will absorb up to 90% of the heat, but that may be wrong.

## 1. How does the color black affect heat absorption?

The color black absorbs more light and heat than any other color. This is because black objects absorb all wavelengths of light, while other colors reflect some of the light. This principle also applies to heat, making black objects absorb more heat.

## 2. What is the specific heat capacity of black paint?

The specific heat capacity of black paint varies depending on the type of paint and its composition. Generally, the specific heat capacity of black paint is similar to that of other colors, but the higher absorption of heat makes it appear to have a higher capacity.

## 3. How can I calculate the exact amount of heat absorbed by black paint?

To calculate the exact amount of heat absorbed by black paint, you will need to know the specific heat capacity of the paint, the surface area of the painted object, and the intensity and duration of the heat source. Then, you can use the formula Q = mcΔT, where Q is the heat absorbed, m is the mass of the object, c is the specific heat capacity, and ΔT is the change in temperature.

## 4. Does the type of surface the black paint is applied to affect heat absorption?

Yes, the type of surface can affect heat absorption. A smooth surface will absorb more heat than a rough or textured surface, as the heat can be absorbed more evenly. Additionally, a larger surface area will absorb more heat than a smaller one.

## 5. Can black paint absorb too much heat?

Yes, black paint can absorb too much heat, which can cause the painted object to become extremely hot. This can be dangerous in some instances and may result in damage to the object or injury to individuals. It is important to consider the potential risks and choose the appropriate type of paint for the intended use.

• Thermodynamics
Replies
6
Views
5K
• Special and General Relativity
Replies
4
Views
521
• Thermodynamics
Replies
3
Views
1K
• Engineering and Comp Sci Homework Help
Replies
4
Views
2K
• Classical Physics
Replies
19
Views
1K
• Engineering and Comp Sci Homework Help
Replies
4
Views
3K
• Introductory Physics Homework Help
Replies
54
Views
7K
• Thermodynamics
Replies
20
Views
10K
• Thermodynamics
Replies
11
Views
1K
• Quantum Physics
Replies
16
Views
1K