×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Specific Gravity

Specific Gravity

Specific Gravity

(OP)
Hi all,

Specific Gravity is defined as (density of fluid) / (density of water @ 4degC & at 1atm).

Does the 'density of the fluid' of interest have to be at the same temperature of that of water (i.e. 4degC) to get an accurate specific gravity figure. I think it does and my calcs kinda prove it, but the internet is full of contradictions, just just wanted to check here if anyone knows for certain

Sames goes for specific density of gas .... whether the density of gas has to be at the same temp and pressure as the reference density of air at STP

RE: Specific Gravity

Answer to the last question - it does not. That's what allows warmer air to rise - it's specific density is lowered by the increase in temperature.

But - it depends on your use. If you means does is specific density is a reference density that is at Standard Temperature and Pressure or if it is the specific density at the instant of interest. The first will be in a text or other reference book, the second will not.

RE: Specific Gravity

wouldn't specific gravity be for the same conditions ? It could be that the density of water is "unaffected" by temperature, so then the change to other conditions would depend only on your fluid.

another day in paradise, or is paradise one day closer ?

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close