### mass communication:

Public relation
* are mass communication
  - promotions
  - things that are done to improve the company image
* broad stroke that's used to smooth over the rough edges of a problem.
* can help activate organizations' social conscience.
* comes in many forms.
* dialogic or audience sensitive activity.
* employs media controlled by others to create a favourable climate of opinion.
* field that demands attention to detail and highly developed writing skills.
* function of management
  - modern management
* helps advertising by creating credibility for a product or service
  - to protect the present position when an organization is under attack
* involves crisis and issue management.
* is all about communication
  - also part of self-justification
* is an ongoing effort that can have either a positive or a negative effect
  - organization s effort to win the cooperation of groups of people
  - common sense and hard work
  - like cosmetics
* is the business of establishing a rapport with a variety of publics
  - process of shaping public opinion
  - total process of building goodwill toward a business
  - what campus journalism mainly consists of today
* means control of a public
  - of getting attention and shaping public opinion
* much-maligned and often misunderstood profession.
* very important part of defending our right to practice social nudity.

### mass unit:

Mass number
* are always whole numbers with no units.
* mass unit
+ Atomic mass
  * As mentioned above, note that the atomic mass of an atom is not the same as its mass number. Mass numbers are always whole numbers with no units.

Atomic mass
* Some atomic mass is decreased by units.
* is mass
  - the number of protons plus the number of neutrons

Body mass
* changes drastically from season to season.
* decreases with the number of pregnancies, independent of age.
* is an estimate of the fat content of the body
  - monitored on a daily basis
  - strongly related to mandible length
* is the primary determinant of mid-femoral bone acquisition during adolescence
  - bone acquisition during adolescent growth
* measure of weight as related to height.

### mass:

Bone mass
* begins to decline at thirty five to forty years of age
  - decrease and skin becomes thinner and looses some elasticity
* declines with age in all people.
* grows rapidly in childhood and throughout adolescence.
* is assessed by the measuring of bone mineral density using bone densitometry
  - low in relatives of osteoporosis patients
  - maintained at a constant level due to the tight balance of bone removal and rebuilding
  - stocked from childhood by eating a calcium-rich diet
* reflects a the balance of resorption and new bone formation.
* revolves around a phenomenon called remodeling.

Greater mass
* accelrates faster and forces the rod and disk to rotate with greater energy.
* has greater gravitational pull.

Laity
* Laities are multitudes.
* are part of the priesthood.
* means the church - the laity.

Large mass
* Most large mass absorbs heat.
* oozes along as a single unit.

Mass flow
* can occur into the soil in response to water uptake by plants.
* means that all of the mass of a dry blend moves uniformally out of the container.

### mass:

Mass spectrometry
* consists basically of weighing ions in the gas phase.
* is also an effective tool to analyze the structure of large biomolecules
  - indispensable for identification of drugs and metabolites
  - nothing other than the study in the gas phase of ionized molecules
  - particularly advantageous for the analysis of complex samples
  - used for larger reactants and product identification
* is used to confirm the synthesized mol
  - identity molecules for research, clinical, and legal purposes
  - select ions for study and for analysis of fragmentation products
  - verify mass of the peptide