Temperature Definition and 1000 Threads

Homework Statement Suppose a room with 75 m3 of air also contains 80 kg of glycerol and the initial temperature in the morning is 16 °C. If 1.2 kWh of heat is added to the room between morning and afternoon, calculate the final temperature of the air in the room in the afternoon. Use 18 °C for...

Homework Statement Suppose a room with 75 m3 of air also contains 80 kg of glycerol and the initial temperature in the morning is 16 °C. If 1.2 kWh of heat is added to the room between morning and afternoon, calculate the final temperature of the air in the room in the afternoon. Use 18 °C for...

By how much (in picograms) does the mass of 1 mol of water at 0° c differ from the mass of 1 mol of ice at 0° c? 1 mol of water = (assuming) 1 mol of ice = 18 g = 1.8E13 pg So, is this a trick question? The logic of a trickster would tell you that there would be no difference, if one assumes...

What will be the final temperature of 3.00 kg of crushed ice with temperature -3.0 C mixed with 4 liters of water with temperature 10.0 C? We can ignore all the energy exchange with the environment What I do know and I do: the weight of the ice = 3 kg Ice temprature = -3 C melting energy = 3...

This problem was translated from Swedish, sorry for any grammatical errors. The problem A cylinder with nitrogen gas inside is closed by a tight piston (that can slide without friction against the walls of the cylinder). The piston weighs ##s=12.5 kg## and holds the ##m=28## grams of nitrogen...

°Thought just occurred to me.. Is there a standard way of referring to temperature either of a phase change? For example if I write.. "1kg of water is cooled from 20°C to 0°C, how much energy was removed?" ...then potentially two answers might be considered correct depending if you include...

Hi there i wonder how can i measure the plasma temperature ? and what is magnetic field have the impact to plasma or not? Thank you all.

Homework Statement The thermal conductivites of the materials are 2k,k,4k respectively. Find the equilibrium temperature at X-Y Y-Zhttps://scontent-kul1-1.xx.fbcdn.net/hphotos-xpt1/v/t34.0-12/11950919_10204794824222021_851218095_n.jpg?oh=c15562066e063b2b164fbe7255d7d5d2&oe=55E9175C Homework...

Is the following correct? Temperature is the measure of how hot or cold something is; not how much thermal energy it has. Examples; 1 kg of boiling water has a temperature of 100 degrees C and has heat energy of 4.184 kJ (the specific heat capacity of water). 1 kg of lead heated to a...

I'm currently doing a design for my final year studies and it's regarding esterification process. My proposed reactor is CSTR, operating at a temperature of 60C and 400 kPa. Reactants are methanol and jatropha oil with sulphuric acid catalyst. For a commercial scale production of biodiesel...

The space above the mercury column in a thermometer ordinarily is evacuated, but due to faulty manufacture, a particular thermometer has a pressure of 2 mmHg of air in this space when the whole thermometer is immersed in a bath at 0 degrees Celsius. Calculate the pressure of the air when the...

How far down can a nickel ball of radius r and temperature Tn melt into the ice block of temperature Ti? Watch the video and state your assumtpions...

http://www.sciencedirect.com/science/article/pii/S0273117715005712 from the abstract: Obviously, the most prominent missing 'forcing' parameter here, is "concentration of greenhouse gasses". There is probably some food for thoughts here, especially when the analysis of Den Volokin and Lark...

Damn title character limits. I just had the weirdest thought while rearranging my computer's case fans. I put my hand in front of one of them and felt a light breeze of air, telling me it was working. This is due to the local cooling produced where the fan's airstream comes in contact with the...

I would like to know what happens to air pressure when it flows from large tube to small tube. I would like to know the basic science behind this though I am pursuing my B.E. Moreover, does PV=mRT law apply here or some other principle applies here. What happens to temperature and other...

Hi hi, Sorry if this is awful and boring. Basically what I want to work out is a way to differentiate two different liquids by touch (specifically, temperature) after shining a light on them. A thermometer cannot be used. The variables open here are the compositions of the liquid (I'm going...

Homework Statement A rigid vessel of volume 5m^3 contains 1.0 kg of water and steam at 19 degree C.Find the pressure and the mass of liquid and vapour in the vessel. The vessel is now heated unit the water is just evaporated. Calculate the the pressure and temperature of this process. The...

Like in a topic. I just got this question and I am looking for some help. I found this one http://wikieducator.org/The1stLawofThermodynamicsLesson5 I don't know, is the heat of combustion is the same as entalphy?

Hi all, Does anyone know where I can find data details of how Emission Spectra depends on temperature for the following materials: Single Hydrogen Molecular Hydrogen (H2) Helium That is, as I heat up each of the above materials by themselves, from room temperature to thousands of degrees, I'd...

Dear PF Forum, Does the Earth core produces its own energy? If it is true, how? Radioactive decay? Gravity? Earth core temperature is around 4000 Celcius. Almost like the sun surface temperature. How can that temperature kept for 4 billions of year? Can the temperature heat the mantle and Earth...

Hello, I'm interested to know if that in a fixed insulated volume (e.g. 500ml), at some temperature (e.g. 293K) and pressure (e.g. 1 atmosphere), and you increase the pressure by a specific amount by pumping more gas (e.g. air at 293K) into the volume can you work out the expected increase in...

Hi all, I'm brushing up on some thermodynamics, and having been reading up on the interpretation of temperature as derived from kinetic theory. I can follow the derivation for an ideal, monatomic gas which relates temperature to the average, translational kinetic energy of the molecules. Most...

Hello, having the following data can I somehow calculate how will the temperature in room change in 1 hour time? room length = 6m room width = 6m room height = 3m lets say radiator is 0.5m x 1.5m and has 2000W and it can be in 2 states: on/off I have also the current air temperature and...

Homework Statement A 100 kN load is applied to a flange positioned midway (at B) along a 50 mm diameter steel bar (ABC). The bar is placed between two rigid supports and is thus constrained. Determine the position of the flange (distance from the left support) if the temperature of the bar...

There are often talks of ground temperature being a constant 55F at 6ft or so. But some also said that in very hot and dry climate, say Arizona desert, temperature is much higher at the same depth. Anyone has any idea of underground (4ft? under) temperature in dry hot desert? Thanks

Hi guys, I have a question on cooling the house. So at night, I usually open windows to let all of the cold air come in and open the 2nd floor windows to let the hot air out. The 2nd floor is a large open area and has windows in the front and windows in the back. Now, I normally open all the...

Hi all, I am looking for a tape or gel that is very thermally insulating and apply that on my glass slide to serve as a thermally insulating material. The work temperature is 100C to 350C and it should be able to work with clean water. Any recommendations?

A system at absolute zero (ground state) can't be be divided into observer and observed, can it? I'm struggling with the relationship between superposition, decoherence and temperature. Decoherence requires information. Information requires energy. Though multiple basis of "information" can...

Dear forum I am working with thermal radiation. This is the specific formula: P = σ ⋅ A ⋅ T4 P = emitted effect (W, J/s) σ = Stefan-Boltzmann constant (5,67 ⋅ 10-8) A = area of object (m2) T = temperature of object (K) How can I get to know the...

Hi, I want to calculate volume of a tank , 1. Tank contains water and it leaves tank at 7 degree celcius and comes back at 11 degree celcius. So ∇T= 4°C. 2. Time required to complately empty 20 Minutes 3. Energy absorbed in raise from 7ºC to 11ºC = 25 KW I need to calculate the volume of...

Hello all, new here please excuse if this is in the wrong area of the forum. My question is does temperature increase in a linear fashion when pressure is added? What formula can be used to accurately monitor temperature increase as pressure is added? Imagine having a set temperature, let's...

Homework Statement What is the maximum mass of lead you could melt with 2000 J of heat, starting from 25 ∘C ? Lead melts at 328∘C , its specific heat is 128 J/(kg⋅K) , and its heat of fusion is 2.5×10^4 J/kg . Homework Equations Need to find both the mass in the heat of transformation (Q =...

Hi, I have a question. If a crystal absorbs light and the absorption process leads to some excess energy being released as heat . Can one calculate the temperature rise or an experiment would most certainly need to be done? Apart from the heat capacity of the crystal before light absorption...

Hello everyone! I have a thesis to design a temperature stabilizing(controlling) system for solar cells.I need to use 12V Peltier battery and a simple pc fan.Any further help is appreciated.

Heyo, first post here...! Sorry for my English and I will reword anything if it is needed. I've been struggling to solve this for a few days, please help me with some insight or intuition. I have application with a a heating element leading to little ceramic crucible, there is an airflow in and...

According to KMT, Avarage kinetic energy of 1 mole gas is=(3/2) x R x T So , in winter in my cold room , the gases have Kea=34J/mole (T=5oC) and in summer that figure climbs to, -roughly- 37J/mole, (T=25oC) Difference is , 3J per mole. If my rooms dimensions are 3m x 3m x 4m, volume is 36m^3...

Hi everyone. I am performing temperature tests on an electronic equipment and I am getting some confusing results. The lowest the ambient temperature, the bigger the delta between the ambient and the equipment case. How is this possible? Is there a law of physics describing this effect? Thanks...

Let's say I have a cold bottle of water in a warm room (temperature is constant). Is it possible to calculate how long it will take for the water to reach a certain temperature? Do you guys know any formula for this? To be more general: What is the effect (W, J/s) that air in a certain...

Hi there guys, I'm conducting an experiment to calculate the mass flow rate of water. Bellow is a copy of the procedure: 1) Weigh the mass in kg of a container 2) Connect a flow meter to a tap (any source) with a pipe and insure the departure pipe goes into a sink 3) Open the tap an increase...

Hello PF, This has been frustrating me for a while: The plasma inside a tokamak is being heated by current induction, which accelerates the ions and electrons in specific directions, thus the velocity of ions increase. These ions collide with each other, eventually randomizing the motion. Now...

I did a simple experiment. I took a small block of copper (40g) and sensitive scales. First I cooled the block in a freezer (-2C) and checked its weight. Then heated it up to 300C in the oven and checked weight again. The difference in weight is well observed (4 - 5mg). Results are consistent...

Homework Statement Daniel Schroeder, introduction to thermal physics problem 1.36 (page 26): "In the course of pumping up a bicycle tire, a liter of air at atmospheric pressure is compressed adiabatically to a pressure of 7 atm. (Air is mostly diatomic nitrogen and oxygen.) a) What is the...

I have a refractory adhesive based upon liquid Na2O3Si and other unknown constituents. It remains a liquid until a specific temperature... when it boils, or gasses. At this point, if the temperature is removed (or increased), the liquid becomes a solid. It would appear (perhaps incorrectly)...

In the constant volume gas thermometer, T (°c)=[P(T)-P(f)]×100/[P(b)-P(f)] (P(T) means gas pressure at T°c P(b) and P(f) for the water's boiling point and freezing point) Is it right?

hello I have a liquid or gas inside a metallic box (eg. stainless steel 5mm thick) how can I increase its temperature without heat convection or conduction?

I know I can use the specific heat capacity formula to find the temperature of the water during electrolysis as long as I know the mass, specific heat constant of water and joules added beforehand: But I'm not sure how I could find the temperature of the gas produced. If the pressure was...

I'm just trying to put together a very basic engine model with extremely limited combustion. Basically, I am modeling isentropic compression, combustion (using LHV to calculate the delta T), and isentropic expansion. At the moment, I am calculating a peak cylinder temperature under motoring of...

Homework Statement Calculate the Debye temperature for gold Homework Equations $$Θ_D = \hbar \frac{v_s}{k_b} \sqrt[3]{6π^2 \frac{N}{V}}$$ Speed of sound in gold: $$v_s=3240 m/s$$ The Attempt at a Solution I used the equation for ΘD and for the concentration I used the value for atom density...

Hi all, Hopefully this is the right subforum. I have a question related to Arduino sensors. Q:Generally, when do you need to be worried about losing data from having long wires from your sensor to your Arduino board? Details:For example, I've been looking at two sensors. Sensor 1: MLX90614...

In the Green Function theory. The Spectrum Function can be related to DOS. However, in the nonzero T condition, we can also define Spectrum Function. In the other hand, in my conception, DOS is the independent quantity which is determined by the system. So, does it mean DOS is actually a...