摘要:

As probably everybody has experienced to his or her dismay, when tea is poured out of a teapot, the jet, more often than not, has a tendency not to flow in a nice ballistic curve, as intended, into the cup, but to follow the underside of the spout, and soil the table cloth.Everyphysicist from a large number whose opinion I asked on the possible reason for this phenomenon, replied it must be due to surface tension or, in other terminology, capillary action or adhesion. Now, surface tension is one of the most nebulous terms of physics; many textbooks on the subject will tell the student that there is no such thing, and that the proper term is surface energy. We need not go into this question here, suffice it to say that when the physicist is pressed to express himself more clearly, he will say that this teapot effect is obviously due to the adhesion between the liquid (tea) and the solid (spout), and that the “phenomenon” was no problem and not worth another minute's thought.

ISSN:0031-9228    

DOI:10.1063/1.3060089

出版商:AIP    

年代:1956

数据来源: AIP

摘要:

I have been a member of the American Physical Society for forty‐six years and accordingly must be classed as an “old timer”. Chronologically speaking, I am next to the oldest surviving past president. Dr. Swann was president in 1932, and I followed him in 1933. All the preceding presidents have passed to their final reward.

ISSN:0031-9228    

DOI:10.1063/1.3060090

出版商:AIP    

年代:1956

数据来源: AIP

摘要:

At the time of the establishment of the Bureau of Standards Technical Advisory Committee for Mathematics a discussion of the role appropriate to the Mathematics Division (Division 11) of the Bureau was undertaken by the Committee. Although the excellence of the Bureau's staff in the mathematical areas in which it had been operating was striking, adequate mathematical consultant services to other Bureau activities seemed to require the establishment and development of a section on mathematical physics. Therefore the Technical Advisory Committee recommended the establishment of a new section. There are now four sections: Numerical Analysis (11.01), the Computation Laboratory (11.02), the Statistical Engineering Laboratory (11.03), and Mathematical Physics (11.04).

ISSN:0031-9228    

DOI:10.1063/1.3060091

出版商:AIP    

年代:1956

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.3060093

出版商:AIP    

年代:1956

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.3060094

出版商:AIP    

年代:1956

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.3060095

出版商:AIP    

年代:1956

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.3060096

出版商:AIP    

年代:1956

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.3060097

出版商:AIP    

年代:1956

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.3060098

出版商:AIP    

年代:1956

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.3060099

出版商:AIP    

年代:1956

数据来源: AIP