When you exhale outdoors on a cold day, you can “see your breath.” Why?

Q: If the volume of a gas is doubled at constant temperature, what will happen to its temperature?

A: According to the ideal gas equation

Q: Why does freezing of water not occur at 0°C when foreign ions are present?

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Q: Why does decreasing the temperature of a liquid make it freeze?

A: As the temperature of a liquid decreases, the randomness in the motion gets decreased. Freezing…

Q: To save energy, some ceiling fans are reversible so that they drive air down or pull it up. In which…

A: During winters ceiling fan should move in reverse(clockwise) direction at a low speed.This will…

Q: Why do we put the small beaker into the larger beaker and pack it with ice, so that the small beaker…

A: The  small beaker is put into larger beaker. The layer between both beaker is filled with ice.

Q: When there is morning frost on the grass in an open park, why is frost unlikely to be found on the…

A: The ground beneath the bench absorbs less solar radiation compared to the open ground. The ground…

Q: Why do farmers fill their fields with water on a cold winter night?

A: Water flows through the fine capillary veins of the plants. If the temperature on a cold winter…

Q: Calculate the number of moles in the 2.00-L volume of air in the lungs of the average person. Note…

A: Volume of air , V = 2 L  = 2×10-3 m3 Temperature of the air T =37 0C =37+273 K = 310 K The gas…

Q: Does a substance that cools off quickly have a high or low specific heat capacity?

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Q: In summer cotton dresses should be preferred, Why?

A: Step 1During summers everyone tends to perspire a lot as a mechanism of our body to keep us cool.…

Q: Why do we feel hot after a long period of running or doing exercise?

A: When we do running or any exercise, it will lead to increase in the muscular activity.

Q: Since all the objects emit energy to the surroundings, why don't the temperature of all the objects…

A: An object which is a good energy emitter will be also very good absorber. Such bodies are said to be…

Q: How can an iceberg survive for several weeks floating in sea water that is above freezing point?

A: The icebergs are the part of the glaciers that is formed during calving or splitting of glaciers.…

Q: For divers going to great depths, the composition of the air in the tank must be modified. The ideal…

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Q: Suppose that the average speed (vrms) of carbon dioxide molecules (molar mass 44.0 g/mol) in a flame…

A:

Q: What property of water makes it an effective coolant?

A: To be an effective coolant, a substance has to have a high specific heat capacity, so that it can…

Q: After filling your gas tank to the top and parking your car in direct hot sunlight, why does the…

A: The molecules are free and widely spreading an expanded gas. So, its density is less as compared to…

Q: The barometer of a mountain hiker reads 750 mbars at the beginning of a hiking trip and 650 mbars at…

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Q: If you boil water in a whistling kettle, the kettle whistle when the water reached  its boiling…

A: In this problem it is asking about why does kettle whistle when the water reached its boiling point.

Q: At 1:00 pm, a thermometer reading 35 deg. celsius is taken outside where the air temperature is 6…

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Q: How does perspiration give the body a means of cooling itself?

A: To determine: How the perspiration give the body a means of cooling itslef

Q: Why do we wear woollen clothes in winter?

A: During winter season the human body temperature increases to the environmental temperature and heat…

Q: You see an ad for a cell phone case that can withstand drops from high buildings, the force of a hit…

A: The case of phone should be made of material which can withstand heavy force. On seeing material at…

Q: Why do frying pans have a thick base?

A: A thick base pan has higher mass hence higher heat capacity. A substance with large heat capacity…

Q: What happens to the temperature of air  when it expands?

A:

Q: If 70°F air feels warm and comfortable to us, why does 70°F water feel cool when we swim in it?

A: To Describe If 70°F air feels warm and comfortable to us, why does 70°F water feel cool when we swim…

Q: Does water boil at higher temperatures at higher pressures? Explain.

A: Water boil at higher temperatures at higher pressures

Q: Why does a piece of watermelon stay cool for a longer time than sandwiches do when both are removed…

A: Given:  watermelon and sandwiches

Q: Birds swell their feather in winter, Why?

A: Birds often swell their feathers in the winter in order to keep themselves warm.

Q: If the pressure of a substance is increased during a boiling process, will the temperature also…

A: The pressure of a substance is increased during a boiling process.

Q: Woolen clothes are worn in winter, Why?

A: Woollen clothes are worn in winter, because air is a poor conductor of heat.

Q: Why do fishermen sail out to the sea in the night? What process helps them to sail easily to the sea…

A: The land’s specific heat capacity is very low as compared to the sea’s specific heat capacity. This…

Q: On cold, clear nights horses will sleep under the cover of large trees. How does this help them keep…

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Q: Why is water a liquid state at 20 degrees Celsius

A: Temperature of water = 20° C

Q: When ice in a pond melts, what effect does this have on the temperature of the neraby air?

A: The nearby air temperature will decrease.

Q: For divers going to great depths, the composition of the air in the tank must be modified. The ideal…

A: desnity of sea water= 1025 kg/m3 desnity of air= 1.2 kg/m^3 We know molecule of oxygen &…

Q: What is quality? Does it have any meaning in the superheated vapor region?

A: The ratio of the mass of the vapor to the total mass of the mixture is known as quality. It is also…

Q: Why does a bottle of tire pump feel hot when you pump air in the tire, but when air is released, the…

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Q: Why is it important to protect water pipes in the winter so that they don’t freeze?

A: Given:  water pipes