|Architectural, engineering, and related services||21%|
|Research and development in the physical, engineering, and life sciences||6%|
|Navigational, measuring, electromedical, and control instruments manufacturing||5%|
|Aerospace product and parts manufacturing||5%|
|Federal government, excluding postal service||5%|
The rest are employed in general-purpose machinery manufacturing, automotive parts manufacturing, management of other companies, and testing laboratories.
Mechanical engineers generally work in professional office settings. They may occasionally visit worksites where a problem or piece of equipment needs their personal attention.
Most mechanical engineers work full time, with some working as many as 60 hours or more per week.
Source: Bureau of Labor Statistics, U.S. Department of Labor, Occupational Outlook Handbook, 2012-13 Edition