A match stick can be lighted by rubbing it against a rough surface, Why?

Q: Even though metal is a good conductor, frost can be seen on parked cars in the early morning even…

A: The radiation from the Sun will be absent early in the morning. Therefore, the surrounding…

Q: Chinawares are wrapped in straw or paper before packing. Why?

A: Chinaware are wrapped in straw or paper before packing, as when it falls on ground, the force of…

Q: Discuss the purpose of a layer of copper or aluminum on the bottom of stainless steel cookware?

A: Copper and aluminum are the very good and efficient conductors of heat.

Q: Why is it easier to start fire with kindling rather than with large match sticks and logs of same…

A: Kindling has greater surface area per unit mass as compared to large sticks and logs. Hence, it…

Q: Why is it possible to hold a lighted match stick until the flame burns quite close to the fingers?

A: The match stick is made up of wood which is the bad conductor of heat. When the lighted match stick…

Q: Pieces of glass and copper are heated to the same temperature. Why does the piece of copper feel…

A: When pieces of glass and copper are heated to the same temperature , piece of copper feel hotter on…

Q: Particles of camphor move around on the surface of water. Why?

A: The surface tension of water decreases when the impurities are dissolved in it. The camphor is…

Q: what do you observe when you rub the ballpen in your skin or hair?

A: Ballpen rubbed on skin or hair

Q: Would regelation occur if ice crystals did not have an open structure? Explain.

A: The structure of ice is similar to that of water molecules. There exist hydrogen bonds in ice…

Q: Chocolate candy in your hand will eventually melt as the heat from your body is released and makes…

A: This phenomenon is due to Conduction of heat. For detailed explanation see next step.

Q: How do I calcualte the surface area of my body times and the energy being radiated per surface area…

A: We need to formulate how to calculate the surface area of your body times and the energy being…

Q: Why does the temperature of boiling water remain the same as long as the heating and boiling…

A: The temperature of the boiling water will not exceed 100°C as long the heating and the boiling…

Q: Discuss the difference between conductors and insulators. Give an example of a material that acts as…

A: Conductors are the materials through which current can flow easily. Examples of conductors are all…

Q: Of the following objects, which would be good insulators against heat? Pick ALL correct answers A…

A: Conductor of heat :-  The object along which heat can move easily says as conductor of heat.…

Q: You have 4,499 g of water at 10 °C in a large insulating beaker. How much boiling water (in kg) at…

A: Given, Mass of water at 10°C = 4.499 g  Final temperature, T = 77° C

Q: Explain why using a fan in the summer feels refreshing!

A:

Q: Wood is better insulator than glass , yet fiberglass is commonly used as insulator in wooden…

A: Wood is better insulator than glass. Because glass is highly viscous liquid contain some but…

Q: Explain why a firewalker can step quickly without harm on red-hot coals with bare feet.

A: A firewalker can step quickly on red-hot coals with bare feet as wood is a very good insulator.

Q: When you rub a piece of ebonite (very hard, black rubber) across a piece of animal fur which…

A: On rubbing a piece of material with another we are doing charging by method of friction.  In method…

Q: A silk cloth is used to rub a glass rod and a piece of fur is used to rub a second glass rod. Both…

A: When silk cloth is used to rub a glass rod, the glass rod will loose electron and becomes positively…

Q: Show that 1 cal/g · ºC =1 kcal/kg · ºC.

A: The calorie is defined as the unit of energy , which is the heat energy absorbed by water of weight…

Q: Cite two reasons why firewalkers don't burn their wetted feet when walking barefoot on red hot…

A: The conductivity of red hot coal is very low. They conduct heat at a very slow rate. When the…

Q: Which is more painful, burn caused by condensing steam or burn caused by boiling water at the same…

A: Given:- Which is more painful, burn caused by condensing steam or burn caused by boiling water at…

Q: Your friend says that the primary difference between a solid and a liquid is the kind of atoms in…

A: No, the basic difference between the solid and liquid is the arrangement of atoms and bonds between…

Q: Why temperature of hand increases when we rub it against each other?

A: Reason : When you rub your hands together, the action of scraping the surface of your skin back and…

Q: Why are bottoms so that utensils for cooking food blackened?

A: Why are the bottoms of cooking utensils are blackened?Black color absorbs maximum amount of heat…

Q: What do you notice when you get into a car that has been sitting in the Sun for a while?

A: the inside of the car will warm because radiation is coming in but not much is going back out.

Q: Why do we say a substance in a liquid phase is more disordered than the same substance in the solid…

A:

Q: If a piece of lead is hammered, it is found to be warmer.Why?

A: Every time a piece of lead is hammered, the kinetic energy of the hammer gets transferred to the…

Q: Explain why high quality thermos bottles have a vacuum lining as a major component of their…

A: The transfer of the heat from any substance takes place in three ways, 1. Conduction, 2. Convection…

Q: Cooking utensils are provided with wooden handles, Why?

A: Wood is a very poor conductor of heat energy, means that heat energy from cooking pan cannot…

Q: Why do some animals curl up into a ball when they are feeling cold?

A: The total energy radiated by a body depends on its surface area . Thus when the animal feel very…

Q: When a chalk piece is immersed in water, bubbles are emitted, why?

A: A piece of chalk has extremely narrow capillaries. As it is immersed in water, water rises due to…

Q: Why are materials such as glass and and rubber good insulators?

A:

Q: In a closed room dust generally settles down. Why?

A: Dust generally settles down in a closed room. The small dust particles acquire a very small terminal…

Q: Is the stickiness of oranges in our hands can be easily washed with tap water?

A:

Q: You are an astronaut in an orbiting space station and someone hands you two wooden balls, outwardly…

A: SOlution:

Q: What is the best material to use to insulate a home?

A: Bulk insulation includes materials such as glass wool, wool, cellulose fiber, polyester and…

Q: Why does the boiling temperature of water decrease when the water is reduced under pressure, such as…

A: A substance starts boiling when the vapor pressure of the substance overcomes the ambient pressure.

Q: What is the reason for the widespread use of fins on surfaces?

A: The phenomenon through which heat transfer from one body to another due to temperature difference is…

Q: Describe one material that is a good insulator

A: Every materials have free electrons in it. So when some potential is applied to that material, the…

Q: Why is it easier to start a fire with kindling rather than with large sticks and logs of the same…

A: Oxygen in air help to burn. Kindling has large surface area than the large sticks and logs of the…

Q: Why is the energy is required to melt a solid?

A: Particles in solid are connected to each other by strong bonds and cannot move freely as in liquid…

Q: Ice is packed in saw dust, Why?

A: Saw dust is a very bad conductor of heat. So, if ice is kept in saw dust, ice will not melt easily.

Q: Which of the following is the best insulator? Glass, copper, meat, iron, or water

A:

Ideal Gas Law

Ideal gas law states that the product of pressure and volume of a gas directly varies with the product of the number of moles, the universal gas constant, and the temperature of the gas.