فشار(Pressure). فشار چیست؟ معادلات فشار P = F/A P = نیوتن (Kg x m/s/s) عرض x طول Pascals or N/m².

Slides:

Advertisements

Similar presentations

Gases, Liquids and Solids

Advertisements

Gases.

Pressure and Temperature

Pressure and Temperature William Thomson “Lord Kelvin”

Gas Pressure. Let’s start with straws…. Both the red and blue arrows represent the same thing—the pressure we feel from the atmosphere What do you notice.

Chapter 11: Gases Coach Kelsoe Chemistry Pages 360–389.

Measuring Gases College Chemistry.

Vapor Pressure Evaporation H 2 O(g) molecules (water vapor) H 2 O(l) molecules.

Pressure. Define vapour pressure. Include: volatility, dynamic equilibrium Define normal boiling point in terms of vapour pressure. Interpolate and extrapolate.

Barometer Vacuum Height of column in. (76 cm) Air pressure Mercury.

Gases 1. The Nature of Gases  Gases expand to fill their containers  Gases are fluid – they flow  Gases have low density  1/1000 the density of the.

Torricelli Barometer The mercury in the tube pushes down with its weight. The bottom of the tube is open to the atmosphere. The air pushes on the open.

Manometer lower pressure higher pressure P1P1 PaPa height 750 mm Hg 130 mm higher pressure 880 mm Hg P a = h = +- lower pressure 620 mm Hg.

Pressure. The amount of force an object puts on a surface. Pressure is measured by a barometer. Atmospheric pressure comes from air being pulled down.

Vapor Pressure Evaporation H 2 O(g) molecules (water vapor) H 2 O(l) molecules.

Not so long ago, in a chemistry lab far far away… May the FORCE/area be with you.

Pressure. Remember, Gas Volume Changes…  Suppose you have a one liter bottle of air. How much air do you actually have?  A liter of air means little.

Ch 11 Gases Gases and Pressure 11.1 Pressure and Force Pressure – (P) the force per unit area on a surface Pressure – (P) the force per unit area on.

1.7.Pressure GCSE Physics David Raju Vundi.

The Gas Laws The density of a gas decreases as its temperature increases.

 States of Matter  Solid  Particles close together  May only vibrate  Liquid  Particles not as close together  Particles may move past each other,

CHAPTER 5: PRESSURE 5.1 Pressure and Its Units

Pressure and Phase Relationships

“States of Matter” adapted from Stephen L. Cotton.

Not so long ago, in a chemistry lab far far away… May the FORCE/area be with you.

Pressure and Temperature William Thomson “Lord Kelvin”

Pressure and Temperature William Thomson “Lord Kelvin”

1. List 5 properties of gases 2. Identify the various parts of the kinetic molecular theory 3. Define pressure 4. Convert pressure into 3 different units.

Section 10-2: Pressure Pressure (P): the force per unit area on a surface Pressure = Force / Area Newton (N): SI unit of force.

AIR PRESSURE. What is pressure? A force that is applied over an area.

Measuring Pressure.

Kinetic Theory and a Model for Gases The word kinetic refers to motion. The energy an object has because of its motion is called kinetic energy. According.

1 Gases Mr. Wally Chemistry. 2 Kinetic Theory of Gases ► Molecules in random motion: strike each other and walls of container. ► Force exerted on walls.

Fluids & Pressure Objectives:

Particle Theory of Matter

Gases and Pressure Section Vocabulary Pressure: the force per unit area on a surface Atmospheric pressure: the force per unit area exerted against.

Lecture 4. Pressure. 4.1 Pressure and it units Pressure = “the normal (perpendicular) force per unit area” Pressure at the bottom of the static (nonmoving)

Chapter 11 - Gases. POINT > Use KMT to explain how gases exert pressure on a container POINT > Define atmospheric pressure POINT > Describe how a barometer.

Weather Part 2: Air Pressure. Air Pressure… is a measure of the force of the air pressing down on Earth’s surface. at any point on the Earth is equal.

Gas Laws! Introduction to Gas Laws.. Key Terms  Pressure: the amount of force per unit area of surface  Newton: the SI unit for force  Pascal: the.

Unit 4 Chapter 10 AP Chemistry. Unlike liquids and solids, they Expand to fill their containers. Are highly compressible. Have extremely low densities.

Gas Pressure.  When you complete this presentation, you will be able to:  describe gas pressure in terms of the motion of gas particles.  describe.

Gas Notes. Physical Properties of all gases  Gases have mass  Gases are easily compressed –Air in you car tires, air in a basketball  Gases will expand.

The weight of Earth’s atmosphere above us exerts a pressure on us. In a way, we live at the bottom of an ocean of air.

1. Pressure is defined as the force per unit area on a surface. 2. The SI Unit for force is the newton (N). A newton is the Force that will increase The.

Homework #1: Vapor Pressure

Chapter 13 States of Matter

Phase Changes Courtesy

Aim # 14: How do we measure the pressure of a confined sample of a gas? H.W. # 14 Study pp (Sec. 5.1) Study class notes.

10.2 NOTES Gas Pressure.

Pressure and Temperature

1- ما تعليقك على هذه الصورة ؟؟

Gases & Atmospheric Chemistry

Gases and Pressure Chapter 11 Section 1.

Manometer measures contained gas pressure U-tube Manometer

Northwestern High School

Chapter 11 Pressure and Force

Evaporation H2O(g) molecules (water vapor) H2O(l).

Manometer measures contained gas pressure U-tube Manometer

How to Measure Pressure

Gases Chapter 13-1.

Chapter 11 Gases and Pressure Section 1.

Pressure and Temperature

Presentation transcript:

فشار(Pressure)

فشار چیست؟

معادلات فشار P = F/A P = نیوتن (Kg x m/s/s) عرض x طول Pascals or N/m²

فشار خیلی پایین فشارهای بالاتر کل سیستم فشار پایینی دارد اما در دهانه گرداب فشار بسیار پایین است و به این دلیل جریان گردابی شدیدی ایجاد می شود.

فشار ستونی از مایع با افزایش ارتفاع آب در ستون فشار آن نیز افزایش می یابد.

The first device for measuring atmospheric pressure was developed by Evangelista Torricelli during the 17 th century. The device was called a “barometer” Baro = weight Meter = measure Evangelista Torricelli, circa 1644 Measuring Pressure “We live submerged at the bottom of an ocean of air.”

Barometer Vacuum Height of column in. (76 cm) Air pressure Mercury

Barometer Vacuum Height of column in. (76 cm) Air pressure Mercury

Barometer Mercury filled 760 mm = 1 atm Water filled mm = 1 atm The barometer measures air pressure Water column (34.0 ft. high or 10.4 m) Atmospheric pressure Mercury column (30.0 in. high or 76 cm )

تغییرات نقطه جوش با ارتفاع Water exerts a vapor pressure of kPa at a temperature of 100 o C. This is defined as its normal boiling point: در نقطه جوش فشار بخار مایع با فشار اتمسفری برابر می شود. x kPa = 253 mm Hg (101.3 kPa) = 33.7 kPa (760 mm Hg)

Manometer lower pressure higher pressure P1P1 PaPa height 750 mm Hg 130 mm higher pressure 880 mm Hg P a = h = +- lower pressure 620 mm Hg

Manometer PbPb PaPa 750 mm Hg P a =

lower pressure Manometer PaPa height 750 mm Hg 130 mm lower pressure 620 mm Hg P a = h = -

880 mm Hg higher pressure higher pressure Manometer PaPa height 750 mm Hg 130 mm P a = h = +

Manometer PbPb PaPa 750 mm Hg P a =

lower pressure Manometer PaPa height 750 mm Hg 130 mm lower pressure 620 mm Hg P a = h = -

880 mm Hg higher pressure higher pressure Manometer PaPa height 750 mm Hg 130 mm P a = h = +

جادوییU-tube Evaporates Easily VOLATILE HIGH Vapor Pressure Evaporates Slowly LOW Vapor Pressure AIR PRESSURE 15psi AIR PRESSURE 15psi AIR PRESSURE 15psi 4 psi2 الکل آب

Barometer Zumdahl, Zumdahl, DeCoste, World of Chemistry  2002, page 451 (a) (b)(c)

تبخیر H 2 O(g) molecules (water vapor) H 2 O(l) molecules

تبخیر H 2 O(g) molecules (water vapor) H 2 O(l) molecules

تبخیر H 2 O(g) molecules (water vapor) H 2 O(l) molecules

روش اندازه گیری فشار بخار 1 atm = 760 mm Hg 760 mm mm = 880 mm Hg Animation by Raymond Chang All rights reserved dropper containing a liquid atm. pressure atmospheric pressure mercury vapor from the liquid 120 mm