Heat | Learn Science, Robotics and Artificial Intelligence

Why does a Candle Flame point upwards | Combustion & Flame | HOTS |

Naman — Tue, 28 Jun 2022 04:16:11 +0000

Think of the candle flame as a #helium-filled balloon: No matter which way you hold the string or the tied-off end, the balloon will stubbornly right itself. In fact, turn a candle upside down, and its flame will shift around to point to the ceiling, as if pulled by an invisible force.

The question now is, why does a #candleflame always point upwards?

Watch out our video to get the answer. Something to think about though, if you light a candle in space, how will the flame look like?

Do you think the shape will remain the same? Does #gravity play a role?

Learn more at: Did you know | Learn Science through Experiments (experihub.com)

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2 Thin Woolen Sweaters are warmer than 1 thick one |Heat| Fibre to Fabric

Naman — Mon, 27 Jun 2022 10:15:36 +0000

Come winters and all of us like to wrap ourselves with colorful Woolen Sweaters…and as the temperature dips further, we realise that another layer of the sweaters is needed to beat the chill. Same is the case with blankets. As the winters reach their peak, even the warmest of blankets are unable to give us the warmth.

In such a case, even a thinner sheet of cotton above the blanket does wonders!! Have you ever wondered what could be the reason behind this? Put your genius brain cells to work and try to come up with a possible explanation for this. And in case you’re still unclear, don’t worry, Experihub is here to help!

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Why do Electric Wires Sag in Summers?| Heat | Thermal Expansion | Class 7

Naman — Mon, 27 Jun 2022 09:49:44 +0000

In the summer, because of thermal expansions, the electric wires sag, and in the winter, due to contraction, they may break. As a result, when setting up the wires between the poles, it’s important to keep them somewhat loose in the summer so that they don’t break in the winter due to contraction.

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Why are electric wires made of Copper & not Silver | Electricity | HOTS

Naman — Mon, 27 Jun 2022 09:44:37 +0000

Silver is a precious metal and it is the only metal with a higher electrical conductivity than copper. But, it is an expensive material when compared to copper. This is why electric wires usually made of copper, but not silver.

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Heat – Understanding Conduction

Naman — Mon, 25 Apr 2022 08:19:58 +0000

Thermal conduction is the transfer of internal energy by microscopic collisions of particles and movement of electrons within a body. The colliding particles, which include molecules, atoms, and electrons, transfer disorganized microscopic kinetic and potential energy when joined, known as internal energy. Conduction takes place in most phases: solid, liquid, gases and plasma.

Heat spontaneously flows from a hotter to a colder body. For example, heat is conducted from the hotplate of an electric stove to the bottom of a saucepan in contact with it. In the absence of an opposing external driving energy source, within a body or between bodies, temperature differences decay over time, and thermal equilibrium is approached, temperature becoming more uniform.

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Convection Experiment | Heat

Naman — Mon, 25 Apr 2022 08:08:55 +0000

Heat transfer is the transfer of heat or thermal energy between physical systems. So when there is a temperature difference between two bodies, heat is transferred from the hot body to the colder body. There are three common modes of heat transfer – conduction, convection, and radiation. In this article, we will discuss heat transfer through convection.

Convection is the process of heat transfer by the bulk movement of molecules within fluids such as gases and liquids. The initial heat transfer between the object and the fluid takes place through conduction, but the bulk heat transfer happens due to the motion of the fluid.

Convection is the process of heat transfer in fluids by the actual motion of matter.
It happens in liquids and gases.
It may be natural or forced.
It involves a bulk transfer of portions of the fluid.

When a fluid is heated from below, thermal expansion takes place. The lower layers of the fluid, which are hotter, become less dense. We know that colder fluid is denser. Due to buoyancy, the less dense, hotter part of the fluid rises up. And the colder, denser fluid replaces it. This process is repeated when this part also gets heated and rises up to be replaced by the colder upper layer. This is how the heat is transferred through convection.

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How Does Exterior Wall Colors Affect The Temperature Inside A Building? | Radiation Experiment

Naman — Mon, 25 Apr 2022 08:04:44 +0000

Radiation heat transfer experiment – The aim of the experiment is to investigate whether the amount of infrared radiation absorbed by a surface increases the temperature and depends on the physical characteristics of that surface . Thermal energy transfer from the sun to the earth in the form of ultraviolet light is an example of heat transfer via radiation.

The color of your home’s exterior influences a lot more than the look of your house. The outside of your house either absorbs or reflects heat, making the inside hotter or cooler. That means the color you select for the outside of your home affects the temperature inside, for better or worse.

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Why Are Heaters Placed Near The Floor & Air Conditioners Near The Ceiling?

Naman — Mon, 25 Apr 2022 07:09:51 +0000

The heater is placed near the floor because the air currents move upwards so the hot air fills up the whole room. Whereas, an air conditioner is placed near the ceiling because the cold breeze tends to settle down. If it is placed near the floor then it will fill just the bottom of the room with cool air. So it is placed near the ceiling so that the whole room cools down.

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How Does A Thermos Flask Work?

Naman — Mon, 25 Apr 2022 07:01:21 +0000

The vacuum flask consists of two vessels, one placed within the other and joined at the neck. The gap between the two vessels is partially evacuated of air, creating a partial-vacuum which reduces heat conduction or convection.

Heat transfer by thermal radiation may be minimized by silvering flask surfaces facing the gap but can become problematic if the flask’s contents or surroundings are very hot; hence vacuum flasks usually hold contents below the boiling point of water.

Most heat transfer occurs through the neck and opening of the flask, where there is no vacuum. Vacuum flasks are usually made of metal, borosilicate glass, foam or plastic and have their opening stoppered with cork or polyethylene plastic. Vacuum flasks are often used as insulated shipping containers.

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Why Is The Back Of A Refrigerator Painted Black?

Naman — Mon, 25 Apr 2022 06:55:36 +0000

It could simply be that black paint is cheaper… But I believe that the external coils on the back of refrigerator are painted black for the following reason: There is a rule in nature that says “a color that is better at absorbing heat is also better at radiating heat.”

The rate at which a body radiates (or absorbs) thermal radiation depends upon the nature of the surface as well. Objects that are good emitters are also good absorbers (Kirchhoff’s radiation law). A blackened surface is an excellent emitter as well as an excellent absorber. If the same surface is silvered, it becomes a poor emitter and a poor absorber.

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