Safety
Vacuum flasks are an implosion hazard, and especially glass vessels can shatter violently. Chips, scratches, or cracks can be a starting point for vessel dangerous failure, especially when the vessel temperature changes rapidly (due to adding hot or cold liquid). Glass vacuum flasks are usually contained in or coated with plastic or other materials to protect from physical damage, and to contain fragments should it break.
In addition, cryogenic storage dewars are usually pressurized, and can explode if pressure relief valves are not used.
Read more about this topic: Vacuum Flask
Famous quotes containing the word safety:
“To emancipate [the slaves] entirely throughout the Union cannot, I conceive, be thought of, consistently with the safety of the country.”
—Frances Trollope (1780–1863)
“... what a family is without a steward, a ship without a pilot, a flock without a shepherd, a body without a head, the same, I think, is a kingdom without the health and safety of a good monarch.”
—Elizabeth I (1533–1603)
“There is no calamity which a great nation can invite which equals that which follows a supine submission to wrong and injustice and the consequent loss of national self-respect and honor, beneath which are shielded and defended a people’s safety and greatness.”
—Grover Cleveland (1837–1908)