However, the growing popularity of Agile practices begs the question of whether they can be applied to the development of tangible physical products and services too?
Why did you delete six of your seven questions? The links in my comment gave you answers to three of them.
The dictionary I linked to defines tangible as "Perceptible by touch". Things you can touch are tangible.
If you can touch something, does that mean it is...
- ...innovative (new)?
No! You can also touch old things.
- ...measurable (able to be measured)?
No! Weight is measurable but you can't touch weight. .
- ...physical? The dictionary gives "tangible or concrete" in its definition.
In the StackExchange Tour it asks visitors to include details about what they have tried before asking a question. A dictionary is something you should try before asking us what a word means.
Welcome to ELL, by the way!