A calorimeter is an equipment provided to meacertain the amount of power moved to its surroundings. Two of the the majority of widespread kinds of calorimeters are the coffee cup calorimeter and also the bomb calorimeter. They can usage the same calorimeattempt ethics, yet are extremely various in design and procedure.

You are watching: What explains the key difference between a bomb calorimeter



A coffee cup calorimeter is essentially a polystyrene (styrofoam) cup or 2 via a lid. The coffee cup calorimeter is operated at constant push (ambient pressure). The cup is partially filled with a well-known volume of water and also a sensitive thermometer is placed via the lid of the cup so that its bulb is listed below the water surconfront. This form of calorimeter is commonly provided for solution based chemisattempt through bit to no volume adjust.

When a chemical reaction occurs in the coffee cup calorimeter, the water absorbs the warmth of the reactivity. Due to the fact that the styrofoam cup insulates the reaction from the exterior human being (adiabatic), we deserve to assume all the reaction"s energy is absorbed into the water.

The readjust in the water temperature is supplied to calculate the amount of heat that has actually been took in (used to make commodities, so water temperature decreases) or developed (lost to the water, so its temperature increases) in the reactivity. The coffee cup calorimeter is regularly only supplied as the initially calorimeter form experiment for a university student, as a result of its simplicity and low expense.




A coffee cup calorimeter is great for measuring heat circulation in a chemical solution, however it can"t be provided for reactions, which involve gases because they would certainly escape from the cup. The coffee cup calorimeter can"t be offered for high temperature reactions either, since these would certainly melt the cup. A bomb calorimeter is offered to measure heat circulation for solids with low to high temperature reactions. Bomb calorimeters deserve to not carry out a chemical solution reactivity because the beginning of the reactivity can not be regulated (triggered). Equally, a bomb calorimeter can not be provided to fire gas samples.

A bomb calorimeter works in the very same manner as a coffee cup calorimeter, via one significant distinction. In a coffee cup calorimeter, the reaction takes place in the water. In a bomb calorimeter, the reaction takes location in a sealed steel container, which is the bomb vessel. The bomb vessel is then put in an insulated adiabatic chamber (polystyrene insulation in some models).

The other significant difference is that the bomb vessel is a sealed high-pressure vessel. The bomb vessel, through the sample inside, is inflated to 30 Bar with pure oxygen. The oxygen assists the burning procedure of the sample to guarantee a finish burn. This consequently provides for a consistent set of outcomes.

When a sample is fired, warmth of the reactivity is entirely took in right into the bomb vessel wall surfaces. No power is shed as a result of a sealed container and insulated by a polystyrene shell, simply choose the coffee cup calorimeter. The just mass (coffee cup had actually a recognized water mass) in the chamber is the constant mass of the bomb vessel, which we call the bomb factor.

The temperature difference of the bomb vessel is measured, simply as it was for a coffee cup calorimeter. Due to the mass of the bomb vessel, time requirements to be offered for the reaction heat to be completely soaked up right into the bomb, however still quicker than 80% of the calorimeters on the sector. Our bomb vessel residences 8 high precision temperature sensors inside the bomb vessel walls, enabling for instantaneous quick and also specific temperature analysis.

The various other distinction of a bomb calorimeter is that the bomb vessel can be resupplied aacquire and aacquire, via a straightforward cooling cycle in in between determinations. Usually our bomb calorimeter are able to run a sample every 6 minutes, so they are exceptionally quick and also basic to set up.



In conclusion, the bomb calorimeter is even more exact and also leaves less room for human error. Our bomb calorimeters usage a digital temperature sensor via a 22 little bit resolution versus an analogue glass tube thermometer supplied in a coffee cup calorimeter. It is faster and also excludes eco-friendly variables that might not have been considered. It likewise gives you the power content of the substance being burned, which means that you carry out not need to calculate it.

If you plan to introduce the values of calorimeattempt to students, then the coffee cup calorimeter is the correct choice. It is cheap, simple to develop and also basic to define. The bomb calorimeter is a major instrument based on the exact same calorimeattempt principles as the coffee cup experiment. Comparatively, the bomb calorimeter calculates eextremely element of the initialization, firing and also last phase of the determination, repeatedly comparing the outcomes against the calibration curve, offering a compensated outcome accurate to four decimal locations.

Only a bomb calorimeter is able to carry out Relative Standard Deviation (RSD), a measurement of determining the repeatable precision of a determination.


DDS Calorimeters has actually developed an oxygen bomb calorimeter mechanism constructed for university use and also finding out organizations. The CAL3K-U Oxygen Bomb Calorimeter System is a low expense, affordable choice through a low throughput and manual oxygen filling station. This device is perfect for university based applications. To inquire around this mechanism or to learn even more visit our product page or contact our team at calo


The Difference Between Calories in Foodstuff and Calories in Combustible Material
Why High Prescertain Oxygen is supplied in Bomb Calorimeters

Leave a Reply Cancel reply

Your email deal with will not be published. Required areas are noted *





Save my name, email, and website URL in my internet browser for next time I article a comment.

See more: Which Statement Best Describes The Basis Of The Band Theory Of Metallic Bonding?

DDS Calorimeters manufactures top quality oxygen bomb calorimeters and combustion bomb calorimeters used for calorific value evaluation of miscellaneous samples for use in laboratories, universities and other establishments. Read even more around the agency and it"s background.

22 Arbeid Avenue, Strydom Park, Randburg, Gauteng, South Africa, 2196

Monday - Friday 8:00 - 16:30 CAT (Closed on public holidays and over the festive season)

Quick Links

DDS Calorimeters

Back to Top