Description

Turn ice 3D square, covering the bended segment of the ice 3D square, and follow it ... Which material(s) did not have enough warmth accessible to dissolve the ice block? ...

Transcripts

Dissolving Ice Cubes otherwise known as. Thermodynamics and Heat Transfer HIGH ASPIRATIONS Created by: Dave Johnson Kathy Holliday-Darr

Miracle Thaw Is it truly a supernatural occurrence? We should look at it…

Melting Ice Cubes: "Icebreaker" J First examination objective: Determine how quick each distinctive test material melts an ice 3D shape AND how the liquefying of the ice 3D square impacts the test material\'s temperature. Build up groups and have them make an organization name Run first trial

Experiment Worksheet

What is the room temperature? Measure and record the temperature of every material. Measure the heaviness of the material being tried. 5 th grade: Convert the weight from pounds to kilograms 6 th grade: Calculate the mass of the material and contrast it with the real estimation. Secondary school: Compare strategies for ascertaining mass and changing over units. I.e., by hand, number cruncher, spreadsheet, draw 3-dimensionally on a CAD framework and measure the properties, web ( http://n93.cs.fiu.edu/measures/fulltable.asp ), and so forth

Calculate the region of the ice 3D square. Talk about: What shape is the ice block? What is the equation for this shape? What estimations will be required? In what capacity can the vital estimations be found?

Calculate Area Trace ice 3D square Measure harmony length: c = Measure stature: h =

Calculate Area Discuss the most ideal approach to find the accompanying estimations: Measure edge: α = Measure the range: r = Calculate l

To Locate Center of Circle Rotate ice solid shape, covering the bended bit of the ice block, and follow it once more. Fold the circle in quarters to find focus or utilize a compass.

Area answers. Give your outcomes to your instructor. Break into little gatherings and look at answers. Thought of one answer for every gathering. Analyze bunch answers. Utilizing the underlying readings, compute the normal. Contrast the normal with the gathering answers. The instructor will utilize this response to ascertain the volume of the ice block.

Place the ice 3D square, side down, on the material. Time from the arrangement to totally softened. Understudies examine: Why is the ice solid shape liquefying? What is occurring? How is it evolving structure? Where does the warmth originate from?

Record: the completion time temperature at the focal point of the puddle outside edge of the plate Share information with different gatherings.

Summary of First Experiment Where did the warmth originate from to liquefy every ice solid shape (from the test material or from the encompassing air) ? What makes one test material quicker at dissolving the ice 3D square than another ? Why did the ice solid shapes move ? Level of answers will rely on upon evaluation level.

Thermodynamics Greek words portray early types of thermodynamics Therme (heat) Dynamics (power) Today it covers a more extensive range of vitality and vitality change I.e., space transport to refrigeration

Thermodynamics Is the connection amongst vitality and matter and it is all over Hair dryers and warmth firearms, irons, heater, ventilation systems, boiling hot water tanks, and so forth. Additionally should be considered when outlining PCs, vehicles motors, VCRs, CD players, dimmer switches, and so forth. What happens if a hair dryer gets excessively hot? a PC gets excessively hot?

5 th Grade Calculate D T (Delta Time - change in temperature of the material being tried.) (T last - T introductory ) Compare understudy D T results to ascertained D T, supplied by the educator, in a line chart on diagram paper or utilizing a spreadsheet. Examine the outcomes

5 th Grade con\'t. Think about the measure of warmth (Q) every material has accessible to the measure of warmth required to dissolve the ice 3D square in a blend bar/line chart. (Information supplied by the educator) Which material(s) did not have enough warmth accessible to soften the ice 3D square? What should be possible to build the accessible warmth? Do you see any relationships between\'s the two charts?

Summary What test material was the best at liquefying ice 3D squares ? Did the shading appear to impact the execution ? Why might an ice 3D square dissolve, regardless of the fact that the test material did not have enough vitality to do it ?

Thermodynamics Therefore, diverse materials are utilized to the exchange heat I.e., the material in the PC chip in the electric radio wake up timer is utilized to keep the chip from overheating.

Miracle Thaw Is it truly a supernatural occurrence?

Suggestions for Higher Grades Complete 5 th grade level science, charts, and so forth., just have the understudies ascertain: The volume and mass of the ice 3D square. The measure of warmth produced by every material. To what extent a particular material will take to liquefy an ice solid shape. Figure the volume and mass of the material being tried, and contrasted with real measured weight. Talk about warmth move in more profundity.

Suggestions for Higher Grades con\'t. Make an intuitive energized PC program that exhibits the investigation. Case: http://socrates.berkeley.edu:7009/simple_machines/

Additional Exercises Compare the same material with various masses. Contrast diverse materials and the same mass. Conduct a web inquiry of things that utilization heat sinks. Cases: Library of Thermodynamics Arizona State Univ. http://www.asu.edu/lib/honorable/material science/thermo.htm Heating framework (heat channel sinks) and fans http://www.kita.or.kr/list/cheil/index.html Laptops http://www.indek.com/heatpipe/hp_app.htm Computers http://www.thermalloy.com/list/htm/dhs57.htm http://www.web_tronics.com/webtronics/heatredmouns.html http://www.heatsink.com/http://www.execpc.com/industrialelectronics/wakefld/wakepg19.html http://www.marlow.com/d_heat.htm Dimmer http://home.swbell.net/evansjim/MyHomeRepair/DimmerSwitch.htm http://www.thermalloy.com/list/htm/eprof41b.htm

Have Fun

Additional slides for cutting edge grades

THERMODYNAMICS The study of vitality (or its capacity to bring about changes), and The connections among the properties of matter. HEAT, Q, is the type of vitality which softened our ice 3D shapes. In the SI framework, we measure Q in Joules.

THERMODYNAMICS Some vital material properties: m is the mass of the material (kg) V is the volume (m 3 ) r is the thickness (kg/m 3 ) C is the particular warmth (J/kg-o C)

Some Material Properties

THERMODYNAMICS For a strong, Q = m C D T This is the measure of warmth relating to an adjustment in temperature If you don\'t have the foggiest idea about the mass, compute it from: m = r V D T is the adjustment in temperature, (T last - T starting )

How much warmth does it take to soften one of our ice 3D squares ? On the off chance that the ice 3D square is at 0 o C, "Inert Heat of Fusion" (measure of vitality expected to go from strong to fluid states. For water, that is 333,700 Joules/kg. On the off chance that our ice 3D square is 0.01 kg, the warmth required is 3,337 Joules.

Do we have enough vitality in our test materials to do that ? Case: A 0.5 kg. piece of steel, beginning at 22 o C, discharges 3255 Joules of warmth when it is cooled to 7 o C. Q = m C D T = (0.5 kg)(434 Joules/kg-o C)(22-7 o C) = 3255 Joules 3337 Joules is required, in this manner, there isn\'t sufficient warmth to liquefy the ice solid shape

Conservation of Energy Better yet, we can settle for the last temperature of the steel to dissolve the ice:

Conservation of Energy A 0.5 kg piece of steel Cools from room temperature (22 o C) to 6.62 o C Gives up enough warmth to soften a 0.01 kg ice 3D square.

Heat Transfer is the stream of vitality which happens when a distinction in temperature exists. can happen between two bodies or even inside a solitary body . What was the distinction in temperature between our ice solid shapes and our test materials ?

CONDUCTION Heat moves through a material from particle to-atom. Fourier\'s Law:

Fourier\'s Law Q is the warmth exchange rate k is a material property, warm conductivity An is the range which warm courses through D T is the temperature contrast D x is the separation the warmth must travel

Fourier\'s Law How would you make the ice solid shapes soften speedier ? What do the terms in Fourier\'s Law show us ? Which variables would you be able to control ?

Fourier\'s Law Fourier\'s Law lets us know how quick warmth will stream. Do we know whether there is sufficient vitality accessible in our test materials to dissolve our ice solid shape ?

Fourier\'s Law The rate of warmth stream is: The steel square cools from 22 o C to 6.62 o C in softening the ice which is 0 o C. As that happens, the estimation of D T diminishes. Thusly, the rate of warmth exchange to the ice diminishes. By what method would we be able to expand the rate for a given material ?

GO TO WORK !!! Decide: if your test materials have enough warmth to soften an ice 3D shape. Measure the rate (time) of warmth exchange. Classify your examination information.