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Chapter 17: Problem 71

What can go wrong if you grasp the handle of a hot skillet with a wet thin dishcloth?

Short Answer

Expert verified
Grasping the handle of a hot skillet with a wet thin dishcloth can lead to rapid heat transfer, causing steam burns. The wet dishcloth is not an effective insulator and increases the risk of burn injuries.

Step by step solution

01

Understanding Conduction

Conduction is the process by which heat is directly transmitted through a substance when there is a difference of temperature between adjoining regions, without movement of the material. A metal skillet is an excellent conductor of heat.
02

Understanding Heat Transfer through Moisture

When a wet cloth comes into contact with a hot object, the water in the cloth can quickly heat up and turn into steam. This can happen very rapidly, transferring the heat from the skillet to your hand.
03

Recognizing the Role of a Wet Cloth

A wet cloth can provide a path for the heat to move from the skillet to your hand more quickly than a dry cloth, as water is also a good conductor of heat. The thinness of the dishcloth means there is less material to absorb the heat, making the heat transfer to your hand more efficient and potentially causing a burn.
04

Acknowledging the Risk of Steam Burns

If the heat is sufficient to vaporize the water in the dishcloth, it can cause steam burns, which can be more severe than dry heat burns because steam can carry a large amount of heat energy.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Understanding Heat Transfer
In the physical world, heat transfer is a fundamental concept, referring to the movement of thermal energy from one object or substance to another. This transfer occurs when there's a temperature difference, with energy flowing from the warmer object to the cooler one until thermal equilibrium is reached.
  • Convection involves the movement of fluid or air.
  • Radiation transfers heat through electromagnetic waves.
  • Conduction, which is the primary focus related to the provided example, happens through direct contact.

Imagine you're holding a cup of hot coffee; heat transfers from the coffee, through the cup, to your hand. That's conduction at work. It's essential for students to grasp how heat transfer plays out in everyday scenarios, like touching a hot skillet, to understand the underlying physical principles.
Diving Deeper into Thermal Conduction
Thermal conduction is the process where heat energy is passed along from molecule to molecule within a material. Materials like metal are excellent conductors because they have free electrons that enable the easy flow of thermal energy.

In the case of our skillet, when it's heated on the stove, the metal conducts that heat evenly across its surface. Now, if you try to touch the handle with a thin, wet dishcloth, the water particles in the cloth speed up as they absorb heat, causing them quickly to turn into steam. This rapid phase change allows for an efficient and quick transfer of a significant amount of heat to your hand, increasing the risk of burns.
Conductors and Insulators Explained
Conductors are materials that allow the flow of electric or thermal energy, while insulators resist this flow. Metals like copper and aluminum are great conductors, often used in cookware for their ability to evenly and quickly distribute heat. On the other hand, materials like wood, plastic, and air are poor conductors and hence, serve as insulators. They are used to prevent the transfer of heat鈥攁s seen in the handles of cooking pots or in thermal insulation in buildings.

So when you use a wet dishcloth鈥攖he water in it being a conductor, not an insulator鈥攊t compromises the safety that an insulating dry cloth would provide.
The Seriousness of Steam Burns
Steam burns are often underestimated, yet they are more severe than traditional hot liquid burns. Steam has a higher thermal energy content because during the process of vaporization, it absorbs a considerable amount of heat鈥攍atent heat of vaporization. When steam makes contact with skin, it releases this energy, causing deeper and more severe tissue damage.

In the context of the skillet example, the thin wet dishcloth might seem harmless, but when it becomes a channel for steam to form and come into contact with your skin, it poses a significant danger of causing a severe burn that requires immediate and appropriate medical attention.

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Most popular questions from this chapter

Hydrothermal vents are openings in the ocean floor that discharge very hot water. Water emerging at nearly \(280^{\circ} \mathrm{C}\) from one such vent off the Oregon coast, some 2400 \(\mathrm{m}\) beneath the surface, is not boiling. Provide an explanation.

In the power plant of a nuclear submarine, the temperature of the water in the reactor is higher than \(100^{\circ} \mathrm{C}\) . How is this possible?

Why does placing a lid over a pot of water on a stove shorten the time it takes for the water to come to a boil, whereas, after the water is boiling, the use of a lid only slightly shortens the cooking time?

What produces the wet underside of a glacier, which enables it to slip down elevated regions?

The quantity of heat \(Q\) that changes the temperature \(\Delta T\) of a mass \(m\) of a substance is given by \(Q=c m \Delta T\) , where \(c\) is the specific heat capacity of the substance. For example, for \(\mathrm{H}_{2} \mathrm{O}, c=1 \mathrm{cal} / \mathrm{g}^{\circ} \mathrm{C}\) And for a change of phase, the quantity of heat \(Q\) that changes the phase of a mass \(m\) is \(Q=m L,\) where \(L\) is the heat of fusion or heat of vaporization of the substance. For example, for \(\mathrm{H}_{2} \mathrm{O}\) , the heat of fusion is 80 \(\mathrm{cal} / \mathrm{g}(\text { or } 80 \mathrm{kcal} / \mathrm{kg})\) and the heat of vaporization is 540 \(\mathrm{cal} / \mathrm{g}\) (or 540 \(\mathrm{kcal} / \mathrm{kg} ) .\) Use these relationships to determine the number of calories to change (a) 1 \(\mathrm{kg}\) of \(0^{\circ} \mathrm{C}\) ice to \(0^{\circ} \mathrm{C}\) ice water, (b) 1 \(\mathrm{kg}\) of \(0^{\circ} \mathrm{C}\) ice water to 1 \(\mathrm{kg}\) of \(100^{\circ} \mathrm{C}\) boiling water, \((\mathrm{c}) 1 \mathrm{kg}\) of \(100^{\circ} \mathrm{C}\) boiling water to 1 \(\mathrm{kg}\) of \(100^{\circ} \mathrm{C}\) steam, and (d) 1 \(\mathrm{kg}\) of \(0^{\circ} \mathrm{C}\) ice to 1 \(\mathrm{kg}\) of \(100^{\circ} \mathrm{C}\) steam.
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