What does elastance mean?
Elastance is a technical noun describing the resistance of an elastic body or system to deformation. In the mechanical sense, it measures stiffness: applied force is divided by displacement, or stress by strain, within the range in which the material behaves linearly. The inverse relationship is especially useful for comparisons, because elastance is the reciprocal of compliance, which measures deformation under load. Springs, structural components, tissues, and blood vessels can therefore be compared according to how strongly they resist stretching or compression. The term also appears in cardiovascular medicine, as in arterial elastance, where it relates to the mechanical properties of artery walls. In everyday English, elastance is relatively uncommon and may occasionally serve as a formal or dated alternative for elasticity or springiness, but its precise technical meaning is its principal modern use.
nounIn mechanics, elastance is the stiffness of an elastic system, defined as the ratio of applied force to displacement or of stress to strain; it is the reciprocal of compliance. More generally, it is an uncommon term for elasticity or the quality of being elastic.
- A technical measure of the stiffness or resistance to deformation of an elastic body or system, equal to the reciprocal of compliance.
- More generally, elasticity or the quality of being elastic, though this use is uncommon in modern English.
"The spring's elastance determines how much force is required to stretch it."
"The model estimates the arterial elastance of the vessel under different blood pressures."
"The test results show that the material's elastance increases as its stiffness increases."
The plural is used when comparing the elastance values of different bodies, systems, or tissues.
"The researchers compared the elastances of healthy and diseased arteries."
Elastance is the number that tells you how hard an elastic system resists being stretched.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does elastance come from?
Elastance is a modern English derivative formed from elastic and the suffix -ance. The root comes through French élastique from Latin elasticus, derived from Greek elastikos, meaning stretchable or capable of being stretched. The same root underlies words such as elasticity, elastomer, and elastography.
How elastance is actually used
Elastance is primarily formal and technical, especially in mechanics, engineering, biomechanics, and cardiovascular medicine. It is not merely a stylistic synonym for elasticity in technical contexts.
Easily confused with elastance
Elasticity is the broad property of deforming and returning to the original shape, whereas elastance is a technical measure of resistance to elastic deformation and is the reciprocal of compliance.