Investigating the Factors Affecting How Quickly Hot Water Cools
Aim: -to sees how quickly water-cools after boiling at different
volumes of water with lids on.
Background: - heat can be lost in many ways and also gain. In human we
gain heat by chemical reactions happening mostly in contracting cells
of active muscle and the cells of the liver. We also gain it from the
sun, which is absorbed through the skin and by eating hot food and
drinks.
Heat is lost to the air by exposed surfaces of the body by conduction
convection and radiation. Heat is also lost by evaporation. The cold
air we breathe in and cold food and drinks products absorb heat and
take heat away. We also lose or gain heat by moving into a colder or
warmer place or by taking off or putting on a piece of clothing and to
take exercise to keep warm.
WHAT HAPPENS TO MOLECULES WHEN THEY ARE HEATED?
When molecules are heated the molecules vibrate faster and faster and
kinetic energy of the particles increases. In the end they have so
much kinetic energy that the particles begin to separate and move more
freely.
HOW DO BIRDS CONSERVE THEIR BODY TEMPERATURE HIGHER THAN THEIR
SURROUNDINGS?
When the temperature is cold birds tend to ruffle their feather, if
you have seen a bird do this they look fatter than they actually are.
What they're doing is trapping air between their feathers and warming
the air. This acts as an insulator and therefore keeps their body
temperature higher than the surrounding.
Hypothesis: - the breaker with the least amount of water in it will
show that it will cool down faster over a period of time because there
are less molecules vibrating together and bumping into each other and
therefore will cool down quicker.
A table of variables
====================
Name of variable
How will it be changed?
Water (independent variable)
The water is changing by the volume in the beaker.
Hypothesis- Water will evaporate the quickest because there isn't heavy sugars in the drinks slowingdown the evaporation process.
be too hot or too cold, this is a safety precaution for me as well as
The various modes of heat loss during this phase include radiation, convection, conduction and evaporation. Radiation contributes to maximum heat loss (approximately 40%) and is determined by the fourth power of difference between ambient and core temperature. Convection is the next most important mode of heat loss (upto 30%), and is due to loss of heat to air immediately surrounding the body. It is proportional to the square root of the velocity of the air currents. Evaporation contributes to less than 10% of heat loss and occurs from cleaning fluids as well as skin, respiratory, bowel and wound surfaces. Conduction accounts for least heat loss (upto 5%) and is due to cold surfaces in contact with the body such as operating room table. After 3-4 hours, a plateau phase is realized when core heat production equals heat loss to the periphery and core temperature reaches a
An Investigation Into How the Thickness of Insulation Affects the Time a Drink Takes to Cool Down
The body has specific ways of controlling the internal temperature: if the body is too cold then involuntary shivering occurs this causes the skeletal muscles to contract therefore producing heat. When conscious movement occurs the muscles again contract and relax which generate heat to warm the body up. Another way the body increases the temperature unconsciously the hairs all over the body stand on end causing a layer of air to be trapped, which acts like an insulator. When the body is too warm sweat is produced from pores in the skin, as this liquid sits on the skin it slowly evaporates causing the body temperature to drop, however if ...
type of energy is lost or gained, and whether or not a factor that is
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heat will stay in the cup and can only escape by rising to the surface
...warming protect any affected body part from direct pressure and ensure the patient is well-hydrated. Do not rub frostbitten skin, attempt to rewarm using a fire or stove, rewarm if there is any possibility of refreezing, and allow the tissue to refreeze if it is successfully thawed (Simon, Bryan).
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Heat energy is transferred through three ways- conduction, convection and radiation. All three are able to transfer heat from one place to another based off of different principles however, are all three are connected by the physics of heat. Let’s start with heat- what exactly is heat? We can understand heat by knowing that “heat is a thermal energy that flows from the warmer areas to the cooler areas, and the thermal energy is the total of all kinetic energies within a given system.” (Soffar, 2015) Now, we can explore the means to which heat is transferred and how each of them occurs. Heat is transferred through conduction at the molecular level and in simple terms, the transfers occurs through physical contact. In conduction, “the substance
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It is then secreted within the small intestine where it helps to break down ethanol, fats and other acidic wastes including ammonia, into harmless substances.
earth?s atmosphere starts to warm, which leads to global warming. Global warming can lead to