Dewey decimal classification no of engineering?

The Dewey Decimal Classification (DDC) doesn't have a specific number for "engineering" as a whole. Instead, engineering is divided into various sub-fields, each with its own DDC number.

Here are some examples of engineering fields and their corresponding DDC numbers:

* General Engineering: 620

* Civil Engineering: 624

* Mechanical Engineering: 621

* Electrical Engineering: 621.3

* Chemical Engineering: 660

* Aerospace Engineering: 629.1

* Computer Engineering: 621.38195

You can find more specific DDC numbers for subfields within each of these areas. For instance, within Civil Engineering (624), you'll find numbers for specific topics like structural engineering, geotechnical engineering, etc.

To find the DDC number for a specific engineering topic, you can use online resources like the Library of Congress website or the Dewey Decimal Classification website.