Astm D 3825 – 90 (Reapproved 2000) pdf free download

Standard Test Method for
Dynamic Surface Tension by the Fast-Bubble Technique1

This standard is issued under the fixed designation D 3825; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.

1. Scope

1.1 This test method covers the determination of the specific
free energy of a liquid-gas surface a short time after formation
of the surface.

1.2 It is applicable to liquids with vapor pressures up to 30.0
kPa (225 torr) and kinematic viscosities up to 4.0 mm/s (4.0
cSt) at the test temperature. Higher viscosities have not yet
been investigated.2

1.3 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
only.

1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to consult and
establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
For specific precautionary statements, see 7.3, 7.4, and 7.5.

2. Referenced Documents

2.1 ASTM Standards:
D 1193 Specification for Reagent Water3
D 1331 Test Methods for Surface and Interfacial Tension of
Solutions of Surface-Active Agents4
E 1 Specification for ASTM Thermometers5

3. Terminology

3.1 Definitions:

3.1.1 surface tension (g)—the specific surface free energy
of a liquid gas interface, millinewton per metre (ergs/cm2
).

3.2 Definitions of Terms Specific to This Standard:

3.2.1 bubble frequency (S)—bubbling rate, s−1.

3.2.2 dead time (to)—time required from start to completion
of a bubble, ms.

3.2.3 surface age (t)—time required to start a new bubble,
ms.

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