This document describes a physical hazard incident in a laboratory involving improper heating of chemicals. A student strongly heated a mixture of chemical liquids in a test tube without shaking, then held it under another student's nose, causing the hot liquids to squirt into her eye and face. The injured student was taken to the hospital and suffered pain, though her injuries were not permanent. The document recommends that students wear safety equipment during experiments, follow procedures carefully like gentle heating, and use techniques properly to prevent such accidents.

1. PRESENTED BY,
DARLA .SRINIVASA RAO MSc MLT
13-PML-11
CASE STUDY ON
PHYSICAL HAZARD
SUBMITTED TO,
Dr D.CAROL

2. Common Laboratory Hazards
Because laboratories involve numerous
chemicals, procedures, and operations, they
require extensive safety precautions.
Laboratory safety involves chemical safety, fire
safety, electrical safety, and other safety
issues.

3. Examples of common hazards include the following:
• Chemical hazards:
Toxins, corrosives, flammables, and reactives
• Biological hazards:
Microbes, animals, plants, and genetically
modified agents
• Radiation hazards:
Ionizing and nonionizing radiation

4. • Physical hazards:
Heating devices, noise, projectiles, fire, cold,
etc.
• Electrical hazards:
Fire and shock
• Mechanical hazards:
MY TOPIC
Moving machinery

5. • Airborne hazardous materials:
Vapors, dust, etc.
• Ergonomic factors:
Standing, repetitive motion

6. TOPIC
An accident caused by improper
heating…

7. An accident
caused by
improper heating…
A student was heating a test
tube containing a mixture
of chemical liquids. Instead
of heating the mixture
gently, he heated it strongly
without shaking.

8. • After heating , he
immediately put the
test tube under the
nose of a girl student
standing next to him for
her to smell the gas
evolved.

9. Continue,,,,
Both students were not
wearing safety
spectacles .The hot
mixture of chemicals ,
liquids suddenly
squirted out of the test
tube onto the left eye
and face of the girl
student , who screamed
consequently for help.

10. • The laboratory
technician immediately
took the injury student
to the preparation room
and washed her left eye
and face with distilled
water continuously until
the ambulance
personnel summoned
by the school arrived.

11. Continue,,,,
The injured student was taken
to the hospital and given
medical treatment.
Fortunately , the students’s
injuries were not
permanent , but she had
suffered a great deal of pain
and had to take sick leave
for a week.

12. PREVENTS
Students should wear
safety spectacles when
doing experiments.
Students should follow
relevant experimental
procedures closely
when doing
experiments (eg: when
only gentle heating is
required do not apply
strong heating).

13. • During experiments,
student should execute
these techniques
properly.(eg shaking a
test tube of chemical
liquids properly on
heating ; smelling gases
evolved from a test tube
by means of waving the
gases towards the nose ,
but not directly above the
test tube) .

14. • Teachers should ensure
that students are aware
of the relevant
experimental technique
before doing
experiments.