What is the natural temperature of air?

NTP – Normal Temperature and Pressure – is defined as air at 20oC (293.15 K, 68oF) and 1 atm (101.325 kN/m2, 101.325 kPa, 14.7 psia, 0 psig, 29.92 in Hg, 407 in H2O, 760 torr).

What causes the temperature of air?

The temperature of the air is caused by the combination of air, water, and land working together. Those three factors heat and cool areas at different rates. Temperature also varies by the time of day, the season, or even the year. When weather people talk about temperature, they are talking about a mean temperature.

What makes the weather hot or cold?

Weather on Earth is caused by heat from the sun and movement of the air. All weather happens in the lower layer of Earth’s atmosphere, which is a layer of gases surrounding Earth. The sun’s heat warms the air in this layer to different temperature levels in different places.

What happens to the temperature of the air?

As air warms up, the molecules start to vibrate and bump into each other, increasing the space around each molecule. Because each molecule uses more space for motion, the air expands and becomes less dense (lighter). As the temperature drops, molecules move more slowly, taking up less room.

What is the coldest temperature in the atmosphere?

The coldest temperatures in Earth’s atmosphere, about -90° C (-130° F), are found near the top of this layer. The air in the mesosphere is far too thin to breathe; air pressure at the bottom of the layer is well below 1\% of the pressure at sea level, and continues dropping as you go higher.

Is winter cold or hot?

Winter is cold because the sun is further away and in summer the sun is closer. The 25.5 degrees tilt and during the summer we or the Northern Hemisphere are tilted toward the sun. Winter is cold because the sun is farther away. Summer is hot because the sun is closer.

What makes summers hot and winters cold?

Answer. Because the earth’s axis is tilted. Many people believe that the temperature changes because the Earth is closer to the sun in summer and farther from the sun in winter. In fact, the Earth is farthest from the sun in July and is closest to the sun in January!

What becomes air when heated?

The correct answer is ​It expands and becomes lighter. When air is heated, the molecules will start to vibrate and bump into each other Because each molecule uses more space for motion, the air expands and becomes less dense. Therefore, the air expands when heated.

What’s the hottest place on Earth?

Death Valley
Death Valley, California, USA The aptly named Furnace Creek currently holds the record for hottest air temperature ever recorded. The desert valley reached highs of 56.7C in the summer of 1913, which would apparently push the limits of human survival.

How does heat travel from hot to cold?

Heat flows from hot to cold The first statement of the 2nd law of thermodynamics – heat flows spontaneously from a hot to a cold body – tells us that an ice cube must melt on a hot day, rather than becoming colder.

Is the flow of heat from hot to cold spontaneous?

   It is important to emphasize that this statement of the 2nd law applies to the spontaneousflow of heat from hot to cold. It is possible, of course, to make a cool object in a warm place cooler – this is what a refrigerator does – but this involves the input of some external energy. As such, the flow of heat is not spontaneous in this case.

How do scientists know if something is hot or cold?

We know that a hot object has a high temperature, and a cold object has a low temperature. And we know that the temperature of an object changes when we heat the object or cool it. Scientists, however, must be more precise than simply describing an object as “hot” or “cold.”

What is the daily temperature of the atmosphere?

We’ve heard the TV meteorologist give the daily value of the temperature of the atmosphere (15 degrees Celsius, for example). We know that a hot object has a high temperature, and a cold object has a low temperature. And we know that the temperature of an object changes when we heat the object or cool it.