R-value

noun
\ˈär-ˌval-(ˌ)yü \

Definition of R-value 

: a measure of resistance to the flow of heat through a given thickness of a material (such as insulation) with higher numbers indicating better insulating properties — compare u-value

First Known Use of R-value

1948, in the meaning defined above

History and Etymology for R-value

probably from thermal resistance

Keep scrolling for more

Learn More about R-value

Dictionary Entries near R-value

Ružička

RV

RVA

R-value

RVer

RVSVP

RW

Statistics for R-value

Look-up Popularity

Time Traveler for R-value

The first known use of R-value was in 1948

See more words from the same year

Comments on R-value

What made you want to look up R-value? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

to enclose within walls

Get Word of the Day daily email!

Test Your Vocabulary

Late Autumn 2018 Words of the Day Quiz

  • frosted-autumn-leaves
  • Which is a synonym of yahoo?
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
Word Winder's CrossWinder

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!