Fundamental biological molecules

physical and microscopic and macroscopic properties of a gas

I think you know about the gas what is gas? So gas is the forth physical state of mater. The pure gas is made of same atoms for example noble gas like neon argon etc. and so many there are in the periodic table and compound molecule made from many atoms for example carbon dioxide etc.

Today my topic is about one of the danger and useful and invisible thing which is called gas. So gas the fourth fundamental state of mater. Today we will discuss the physical property macroscopic and microscopic property of a gas.so let’s get started.

GAS history:  in 17^th century jan Baptist van helmont use first time the word Geist an alternative story is that Van Helmont's word is corrupted from gahst (or geist), signifying a ghost or spirit. This was because certain gases suggested a supernatural origin, such as from their ability to cause death. Some gas is dangerous which cause death. At that time of people don’t know about it and then the word geist converted to gas.

Physical properties of gas: the physical properties of gas are the number one is pressure.

Pressure is the amount of force applied perpendicular to the surface of an object per unit area.

For example, there are some gas in this cooker and the gas molecule will collide with each other and release the gas to find the pressure. The symbol for it is p or P. the SI unit of pressure is Pascal (Pa), equal to one newton per square meter (N/m2).

Volume: not a speaker volume it is an amount of substance. The amount of gas The volume of gas increases proportionally to absolute temperature and decreases inversely proportionally to pressure, approximately according to the ideal gas law:

V=nRT/p{\displaystyle V={\frac {nRT}{p}}}

where:

·         p is the pressure

·         V is the volume

·         n is the amount of substance of gas (moles)

·         R is the gas constant, 8.314 J·K⁻¹mol⁻¹

·         T is the absolute temperature

·         The si unit is meter cube

Temperature: SI units is kelvins. temperature also one the physical property of gas which we can observe. Temperature also effect on gas If the temperature increases the volume of gas increase.

Number of particles:

. These four characteristics were repeatedly observed by scientists such as Robert Boyle, Jacques Charles, John Dalton, Joseph Gay-Lussac and Amedeo Avogadro for a variety of gases in various settings. If you want to know about these laws link in the discerption.

MACROSCOPIC PROPERTIES OF GAS: if you find the microscopic property of a gas first of all you mast know about the pressure of a gas.

For example, this is the specific container and and this is the frame of references for example gas container and next is length of time how much time they take.

TEMPRATURE: the speed of gas is proportional to absolute temperature.

VOLUME: that property that represent the amount of gas.

DENSITY:    the amount of mas per unit volume of a substance.

Two properties extensive and intensive properties

Extensive properties which depends on the amount of gas.

Intensive property which does not depends of amount of substance.

MICROSCOPIC PROPERTIES OF GAS: the microscopic properties of gas which are interrelated to the macroscopic properties.

Motion of gas: we cannot see the motion of gas but one the model is Brownian motion zigzag motion. Model are describing in the description.

Intermolecular forces: the forces which exist between gas molecules. For example this is the force between h2o molecule. There are many forces like van der wall forces debaye forces etc.

We will make a video on all these forces.