Mô Phỏng Nhiệt Lượng Kế Bom
Embed This Widget
Add the script tag and a data attribute to embed this widget.
Embed via iframe for maximum compatibility.
<iframe src="https://chemfyi.com/iframe/entity//" width="420" height="400" frameborder="0" style="border:0;border-radius:10px;max-width:100%" loading="lazy"></iframe>
Paste this URL in WordPress, Medium, or any oEmbed-compatible platform.
https://chemfyi.com/entity//
Add a dynamic SVG badge to your README or docs.
[](https://chemfyi.com/entity//)
Use the native HTML custom element.
Đo hàm lượng năng lượng của thực phẩm bằng nhiệt lượng kế
Mục tiêu
Đo hàm lượng năng lượng (calo) của các loại thực phẩm khác nhau bằng cách đốt cháy và đo nhiệt lượng truyền cho nước.
Bối cảnh
A simple food calorimeter uses the heat from burning food to raise the temperature of water. By measuring the mass of food burned and the temperature rise of the water, the energy content can be calculated. This demonstrates why some foods have more calories than others.
Cảnh báo an toàn
- Open flame — keep flammables away
- Burning food produces smoke — ventilate
- The can will get hot — do not touch with bare hands
PPE cần thiết
Vật liệu
-
Food samples (10 g each)Peanuts, cashews, marshmallows, chips
-
Distilled water (400 mL)
-
Aluminum foil (1 sheet)For makeshift shield
Thiết bị
Quy trình
Measure 100 mL of water and pour into the soda can. Record the initial temperature.
Set up the can on the ring stand. Position a mounted needle below the can to hold the food sample.
Weigh a food sample (e.g., one peanut) accurately. Impale it on the needle.
Light the food sample with the lighter. Position it under the can to heat the water.
When the food stops burning, immediately stir and record the maximum water temperature.
Calculate energy: q = m(water) × c × ΔT. Convert to kJ/g or Cal/g.
Repeat for different food types. Compare measured values with nutritional labels.
Discuss why measured values are lower than label values (heat lost to surroundings).
Kết quả dự kiến
Nuts (high fat) should give the highest energy per gram (~25 kJ/g measured vs ~25 kJ/g label). Marshmallows (sugar) ~15 kJ/g. Measured values will be 30-50% lower than label values due to heat losses.
Dọn dẹp
Allow everything to cool. Dispose of food residue. Rinse the can and clean the work area.
Chi tiết
- Danh mục
- Thermochemistry
- Độ khó
- Intermediate (High School)
- Thời gian
- 45 phút
- Chi phí ước tính
- $10,00
- Số bước
- 8
- Vật liệu
- 3