R-value

noun
\ ˈär-ˌval-(ˌ)yü How to pronounce R-value (audio) \

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

having no equal

Get Word of the Day daily email!

Test Your Vocabulary

Words from Greek and Latin Quiz

  • roman forum
  • Which of the following months comes from a Latin word for “ten”?
True or False

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

TAKE THE QUIZ
SCRABBLE® Sprint

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!