Hey there! We receieved your request
Stay Tuned as we are going to contact you within 1 Hour
One of our academic counsellors will contact you within 1 working day.
Click to Chat
1800-5470-145
+91 7353221155
Use Coupon: CART20 and get 20% off on all online Study Material
Complete Your Registration (Step 2 of 2 )
Sit and relax as our customer representative will contact you within 1 business day
OTP to be sent to Change
Quantum Mechanical Liquid
Quantum Mechanical Liquid: - Liquid helium is unique in that it exists in two forms He I and He II (liquid helium is obtained by joule-Thomson expansion of the gas previously cooled to 15K which is below the inversion temperature of He i.e., 35K). The liquid helium I boils at 4.2K and has normal liquid properties. One cooling he I to 2.19 K and 38 mm pressure, it changes to He II with abrupt changes in many physical properties such as density, dielectric constant and specific heat. He II is super fluid having so low energy that thermal motion of atoms do not take place, however, interatomic forces are also so weak that it does not occupy solid state. Thus He II is liquid with properties of gas. It has following characteristics:-
(i) It has very high heat conductance -600 times of copper.
(ii) It has very low viscosity – 1/100 of H2 gas.
(iii) It has very flat meniscus – a low surface tension and creeps over the surface of glass container.
Get your questions answered by the expert for free
You will get reply from our expert in sometime.
We will notify you when Our expert answers your question. To View your Question
Win Gift vouchers upto Rs 500/-
Register Yourself for a FREE Demo Class by Top IITians & Medical Experts Today !