MU | Faculty Site | Dr. SaMeH S. Ahmed

Changes of specifi

Changes of specific weight

Unlike density, specific weight is not absolute. It depends upon the value of the gravitational acceleration, which varies with location. A significant influence upon the value of specific gravity is the temperature of the material. Pressure may also affect values, depending upon the bulk modulus of the material, but generally, at moderate pressures, has a less significant effect than the other factors. ^[2]

[edit]
Uses

[edit]
Fluid mechanics

In fluid mechanics, specific weight represents the force exerted by gravity on a unit volume of a fluid. For this reason, units are expressed as force per unit volume (e.g., lb/ft³ or N/m³). Specific weight can be used as a characteristic property of a fluid. ^[2]

[edit]
Soil mechanics

Specific weight is used as a property of soil often used to solve earthwork problems.

In soil mechanics, specific weight may refer to:

Moist unit weight, which is the unit weight of a soil when void spaces of the soil contain both water and air.

$gamma = frac{(1+w)G_sgamma_w}{1+e}$

where

$gamma$ is the moist unit weight of the material

$gamma_w$ is the unit weight of water

w is the moisture content of the material

Gs is the specific gravity of the solid

e is the void ratio

Dry unit weight, which is the unit weight of a soil when all void spaces of the soil are completely filled with air, with no water.

The formula for dry unit weight is:

$gamma_d = frac{G_sgamma_w}{1+e} = frac{gamma}{1+w}$

where

$gamma$ is the moist unit weight of the material

$gamma_d$ is the dry unit weight of the material

$gamma_w$ is the unit weight of water

w is the moisture content of the material

Gs is the specific gravity of the solid

e is the void ratio

Saturated unit weight, which is the unit weight of a soil when all void spaces of the soil are completely filled with water, with no air.

The formula for saturated unit weight is:

$gamma_s = frac{(G_s+e)gamma_w}{1+e}$

where

$gamma_s$ is the saturated unit weight of the material

$gamma_w$ is the unit weight of water

w is the moisture content of the material

Gs is the specific gravity of the solid

e is the void ratio^[3]

[edit]
Mechanical engineering

Specific weight can be used in mechanical engineering to determine the weight of a structure designed to carry certain loads while remaining intact and remaining within limits regarding deformation.

The Best Book

Prayer Times

Click here

Time in Riyadh

Office hours

Sunday: 10-1

Monday: 12-1

Wednesday: 10-11

You are welcome to contact me by at any time

You may also contact me via WhatsApp group

Ext. 2524

Time Table 2018-19S

Civil Eng. Students

DON'T miss!

Love your department and be proud of your field of study

As we approaching the second midterm exams.. Get ready and remember our offices are open to answer you . do not hesitate to .contact me if you have difficulties

For CE 370 students : Your second midterm exam will be on Wednesday 27 March 2019. In the surveying lab

Good Luck

Announcements

My Dear Students

Please visit the announcement box for the relevant course and make sure that you can download and upload easily, otherwise

.contact me to sort it out

There will be an orientation session in the midell of this term to help you select your track in Civil and Environmental Engineering

Special Event

Special Issue

Electrical Power Resources: Coal versus Renewable Energy

Published Online on January 2016

Mining Engineering

Mining engineering is an engineering discipline that involves practice, theory, science, technology, and the application of extracting and processing minerals from a naturally occurring environment. Mining engineering also includes processing minerals for additional value.

Environmental Engineering

Environmental engineers are the technical professionals who identify and design solutions for environmental problems. Environmental engineers provide safe drinking water, treat and properly dispose of wastes, maintain air quality, control water pollution, and remediate sites contaminated due to spills or improper disposal of hazardous substances. They monitor the quality of the air, water, and land. And, they develop new and improved means to protect the environment.

My Page at Facebook

https://www.facebook.com/sameh.saadeldin

Proverb

Actions speak louder than words

Tawasl

College of Eng. MU

http://mu.edu.sa/ar

Univeristies

Universities I've worked in

Assuit University (Home University), Egypt

Imperial College, London, UK

Faculty of Engineering, Al-Mergeb University, Libya

King Saud University, KSA

,Majmaah University

Majmaah University has a very nice web page that provide all information regarding deanships, colleges, activities, campuses and many others. Search your request in

http://mu.edu.sa/en

Also visit

My Academic Pages

https://www.researchgate.net/profile/Sameh_Ahemd

and give me

Think

Sports

Ahly vs Zamalek, 30 March 2019

Africa Nation Cup, June 2019

Currency Converter

https://www.oanda.com/currency/converter/

Translate

https://translate.google.com/

Course 2018/19-2

Surveying 1 CE 370
Surveying II CE 371
Senior Design II (round 6) CE 499

The Rules of Life

Rule #1

Latest

Member of the Editorial Board: " Journal of Water Resources and Ocean Sciences" 2013 till now

https://www.researchgate.net/profile/Sameh_Ahmed5/?ev=hdr_xprf

Participating in The Third International Conference on Water, Energy and Environment,(ICWEE) 2019 - American University of Sharjah, UAE 26-28 March 2019 with a Paper and Poster

New article

Coming soon

2nd Midterm Exams on 3/4/2019

Student Conference

Participation in the 6Th Student Conference

With a paper and oral presentation

From the Senior Design Project CE499 -35

See inside, the paper, and presentation

CE 370 Course

Surveying I

2018-2019S

		Power point
		Sheets
		Lecture notes
15	3-4-2019	:Second Midterm Exam
		Results
		Model Answer

Inside, please follow

Working marks is available -Click on Surveying I

CE 371 Course

Surveying II

2018-2019-2

		Lectures

		First midterm exam
		Lab
		Results

See Inside

Working marks out of 60 is available- Click on Surveying 2

CE 474 Course

Photogrammetry

2018-2019-1

Available	0-1-2-3-4	Power point
Available	Quizzes 2 and 3 with model Answer	Quizzes
Available	Chapter 1,2,3,4,5	Lecture notes
	Report 1 Cameras	Report
Y	60 marks	Exams