front cover

Gasometer used by Lavoisier to precisely measure the masses of gases to show the conservation of mass in the synthesis of water from hydrogen and oxygen.
(Reproduced with permission from Antoine-Laurent Lavoisier, Elements of Chemistry, Plate VIII, Dover Publication, Inc., 1965. )

back cover


Antoine-Laurent Lavoisier
(1743–1794)
( Illustration: Subhankar Biswas )

 

January 2012 Volume 17 Number 1 Contents

EDITORIAL
1
--- K L Sebastian
CARTOON
3

Science Smiles

--- Ayan Guha

SERIES ARTICLES
6

Dawn of Science

Measuring the Heavens

--- T Padmanabhan

GENERAL ARTICLES
11

Antoine-Laurent Lavoisier

--- Gopalpur Nagendrappa

 

23

Ehrenfest's Theorem and Nonclassical States of Light

Ehrenfest's Theorem in Quantum Mechanics

--- Lijo T George, C Sudheesh, S Lakshmibala and V Balakrishnan

33
44
53

States of Physical Systems in Classical and Quantum Mechanics

--- K S Mallesh, S Chaturvedi, R Simon and N Mukunda

 

CLASSROOM
76
REFLECTIONS
83

Darshana Jolts

More on Force

--- V V Raman

CLASSICS
92

Excerpts from Elements of Chemistry

--- Antoine-Laurent Lavoisier

INFORMATON & ANNONCEMENTS
101
102

Flowering Trees
--- (Credits: K Sankara Rao, IISc, Bangalore)