What happens to the density of the air when the gas in a balloon is heated and the volume of the balloon increases group of answer choices?
Explanation: The density of the hot air trapped inside the balloon is indeed lower than the density of the air outside the balloon. Since density tells you the mass of the gas, which is presumed constant, per unit of volume, an increasing volume will result in a decreasing density.
Why is the air in a hot air balloon is less dense than in a balloon at colder temperatures?
If a gas expands when heated, then a given weight of hot air occupies a larger volume than the same weight of cold air. Hot air is therefore less dense than cold air.
What happens as air inside the balloon heats up?
When the air inside the balloon is heated, the speed of movement of those air molecules increases and the pressure goes up. After a while the balloon is completely expanded and the flight is ready to take off.
Why does the density of gas in a hot air balloon increase as the gas is cooled?
As air is heated, it becomes less dense than the surrounding cooler air. The less dense hot air has enough lifting power to cause the balloon to float and rise into the air.
How does temperature affect gas density?
Focus Question: How does temperature affect density? When a liquid or gas is heated, the molecules move faster, bump into each other, and spread apart. Because the molecules are spread apart, they take up more space. They are less dense.
What is the relationship between density and temperature?
Density and pressure/temperature Density is directly proportional to pressure and indirectly proportional to temperature. As pressure increases, with temperature constant, density increases. Conversely when temperature increases, with pressure constant, density decreases.
What decreases the density of a gas?
Since the mass of the gas is also kept constant, the only way to change its density is to change the volume it occupies. What that tells you is that increasing the pressure of the gas will cause its volume to decrease. Likewise, decreasing the pressure of the gas will cause its volume to increase.
Why does density decrease with temperature?
Density changes with temperature because volume changes with temperature. As you heat something up, the volume usually increases because the faster moving molecules are further apart. Since volume is in the denominator, increasing the volume decreases the density.
How does the density of liquids vary with temperature?
As the temperature increases, volumes of most of the liquids also increases and when the volume increases density decreases. Similarly, when temperature decreases, the volume of most liquids decreases which increases the density. Water has maximum volume at 4-degree Celsius and maximum density at 4-degree Celsius.
Does temperature or salinity affect density more?
Less dense water floats on top of more dense water. Temperature has a greater effect on the density of water than salinity does. So a layer of water with higher salinity can actual float on top of water with lower salinity if the layer with higher salinity is quite a bit warmer than the lower salinity layer.
What is the relationship between salinity and temperature?
The density of water increases as the salinity increases. The density of seawater (salinity greater than 24.7) increases as temperature decreases at all temperatures above the freezing point.
What increases the salinity?
Evaporation of ocean water and formation of sea ice both increase the salinity of the ocean. However these “salinity raising” factors are continually counterbalanced by processes that decrease salinity such as the continuous input of fresh water from rivers, precipitation of rain and snow, and melting of ice.
Is salinity higher in warm or cold water?
When the water molecules of the ocean become heated, they expand. Since warmer water thus can hold more salt and other molecules than cold water; it can have a higher salinity.
Why is sea water cold in day time and warm at night?
Ocean Effect The sea air keeps things warmer at night and cooler during the day. This is because of the atmospheric mixing and local winds that are created. The last idea is one of big ocean currents. Generally the ocean is warmer at lower latitudes and colder at higher latitudes.
Is warm ocean water saltier?
Warm water does hold more salt – at saturation, but seawater isn’t even close to saturation. Surface sea water gets warm, starts to evaporate (hence clouds) and therefore gets denser. So it sinks to the ocean floor, where it cools down to about 4 deg Celsius, and gets denser still.
What is the average salinity of ocean water?
Sea water salinity is expressed as a ratio of salt (in grams) to liter of water. In sea water there is typically close to 35 grams of dissolved salts in each liter. It is written as 35 ‰ The normal range of ocean salinity ranges between 33-37 grams per liter (33‰ – 37‰).
Which ocean has lowest salinity?
The Arctic Ocean’s salinity varies seasonally as the ice cover melts and freezes; but it is the lowest on average due to low evaporation and heavy freshwater inflow from rivers.
What percentage of the ocean is salt water?
approximately 3.5%