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Is acetylene lighter than air?
No, Acetylene is heavier than air. In fact for this reason most countries do not allow its use for welding in confined spaces. Because in the past, leaking acetylene cylinders have filled up the bottom of the area to be welded, with explosive results. Actually it is slightly lighter than air. Air is roughly 79% Nitrogen and 21% Oxygen. Both Oxygen and Nitrogen exist naturally as homo-nuclear diatomics N2 and O2. Nitrogen has a molecular weight of 28.0 amu(atomic mass unit). (14.0 amu x2) Oxygen has a molecular weight of 32.0 amu. (16.0 amu x2) 28.0 amu x0.79 + 32.0 amu x0.21 = 29.0 amu the effective average molecular weight of air is 29.0 amu Acetylene has a molecular weight of 26.0 amu. [Acetylene=HC2H, C=12.0 amu, H=1.01 amu, (12.0 amu x2+1.01 amu x2=26.0 amu)] 26.0 amu < 29.0 amu thus acetylene is roughly 10% lighter than air.
Why does dissolved oxygen decrease with temperature?
Dissolved oxygen decreases with temperature because warmer water holds less oxygen than cooler water. As water temperature rises, the molecules move faster and are less able to hold onto oxygen molecules, causing a decrease in the amount of dissolved oxygen in the water.
What happens to nitrogen liquid when heated?
When nitrogen liquid is heated, it will turn into gaseous nitrogen. As the temperature rises, the nitrogen molecules gain enough energy to break free from the liquid state and escape into the gaseous phase.
Is oxygen more dense or less dense then air?
Oxygen is slightly more dense than air. The density of oxygen at room temperature is approximately 1.429 grams per liter, while the density of dry air is around 1.225 grams per liter. This is due to the fact that oxygen molecules (O2) have a higher molecular weight than the average molecular weight of air.
When you put a jar over a burning candle in a tin pan with a little bit of water why does the water rise to take the place of oxygen burnt why not the carbon dioxide formed?
The water rises to take the place of the oxygen because the burning candle consumes the oxygen in the jar. The carbon dioxide formed is heavier than the air, so it stays closer to the bottom of the jar, while the water rises to fill the space left by the consumed oxygen.
What happens when water vapor is lighter than nitrogen or oxygen?
Water vapor is a gas so it is in the air. Nitrogen and nitrogen are in the air too, but there is more nitrogen than anything in the air. I believe it rises because it is lighter, like a balloon filled with helium.
Why does helium float?
Helium molecules are lighter than most air molecules in the atmosphere (mostly nitrogen and oxygen) therefore they are prone to rise while heavier molecules move downward.
Why hot air rise?
because it is lighter and less dense
Is a tank of helium lighter than a empty tank?
No, helium has weight, but it rises when its in an expandable container such as a balloon because it is lighter than the nitrogen rich atmosphere but inside of a rigid container the helium can only add weight. (see the mythbuster's episode about the helium football)
Why do helium and hot air balloon's rise?
Helium and hot air balloons rise because the air inside them is lighter than the surrounding air. Helium is lighter than the nitrogen and oxygen in the atmosphere, causing it to float upward. Similarly, hot air balloons rise because the heated air inside is less dense than the cooler air outside, creating lift.
Why is moist air associated with low air pressure?
Warm, moist, humid, air associated with a low pressure system is actually lighter than dry air - owing to the fact that hydrogen molecules in water vapor (H20) are lighter than Oxygen or Nitrogen molecules. This moist air rises - causing air pressure to be relatively low compared to surrounding air.
Why does helium rise while carbon dioxide sink?
Helium rises because it is less dense than the surrounding air. On the other hand, carbon dioxide sinks because it is more dense than the surrounding air. This difference in density causes helium to float upward and carbon dioxide to sink downward.
When the water is evaporated the water level decreases?
The water decreases, because as it evaporates, hydrogen/oxygen is converted to a lighter than air gas which rises and reduces the mass of the water thereby reducing the amount of water.
Why does the temperature in the thermosphere steadily rise?
The temperature in the thermosphere rises because of the absorption of high-energy solar radiation by gases like oxygen and nitrogen in this layer of the atmosphere. The density of these gases is extremely low, so there are few particles to absorb the heat from the radiation, causing the temperature to increase significantly.
What is important in the formation of clouds?
Because is involves a transfer of heat energy.
How does helium make a balloon fly?
Helium rises because it is less dense than the air. If it is less dense then it will rise above the air until it meets a gas lighter than it. There are other gases lighter than air. You should experiment with other gases inside balloons.Less dense, or 'lighter than Air'.A one liter balloon filled with Helium and placed on a weigh scale will weigh less than the same balloon filled with air.Less *apex
Why does the fat float on milk?
Fat rises to the top of milk because milk is a complex substance, and eventually will separate. Fat rises to the top because it is one of the lighter substances that make up milk.
